https://www.explainxkcd.com/wiki/index.php?action=history&feed=atom&title=Talk%3A1231%3A_Habitable_ZoneTalk:1231: Habitable Zone - Revision history2026-05-24T20:56:22ZRevision history for this page on the wikiMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=301169&oldid=prevSilverTheTerribleMathematician at 03:53, 13 December 20222022-12-13T03:53:21Z<p></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 03:53, 13 December 2022</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l39" >Line 39:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>;Another means to an end</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>;Another means to an end</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*Don't bother with a mirror out in space.  Take a television and put it across the end of the telescope and feed it from a camera on the moon that is pointed at the Earth.  Are any of the cameras left by Apollo still working? [[User:Nutster|Nutster]] ([[User talk:Nutster|talk]]) 13:06, 8 October 2019 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>*Don't bother with a mirror out in space.  Take a television and put it across the end of the telescope and feed it from a camera on the moon that is pointed at the Earth.  Are any of the cameras left by Apollo still working? [[User:Nutster|Nutster]] ([[User talk:Nutster|talk]]) 13:06, 8 October 2019 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">There may as well not be intelligent life on the surface of that planet, considering that the astronomer is THAT gullible. [[User:SilverTheTerribleMathematician|SilverTheTerribleMathematician]] ([[User talk:SilverTheTerribleMathematician|talk]]) 03:53, 13 December 2022 (UTC)</ins></div></td></tr>
</table>SilverTheTerribleMathematicianhttps://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=181008&oldid=prevNutster: Forget a mirror. Use a TV.2019-10-08T13:06:26Z<p>Forget a mirror. Use a TV.</p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>;Title text</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>;Title text</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The explain for the title text is still incorrect. The telescope looking at US is not the mirror messing the astronomer! --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 18:45, 10 August 2014 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The explain for the title text is still incorrect. The telescope looking at US is not the mirror messing the astronomer! --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 18:45, 10 August 2014 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">;Another means to an end</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*Don't bother with a mirror out in space.  Take a television and put it across the end of the telescope and feed it from a camera on the moon that is pointed at the Earth.  Are any of the cameras left by Apollo still working? [[User:Nutster|Nutster]] ([[User talk:Nutster|talk]]) 13:06, 8 October 2019 (UTC)</ins></div></td></tr>
</table>Nutsterhttps://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=73378&oldid=prevDgbrt at 18:45, 10 August 20142014-08-10T18:45:29Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Exoplanet detection techniques like Doppler spetroscopy have to make corrections for the motion of the Earth. Omitting such corrections will result in the "discovery" of a planet which is actually the Earth... [[User:Sabik|Sabik]] ([[User talk:Sabik|talk]]) 04:31, 19 January 2014 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Exoplanet detection techniques like Doppler spetroscopy have to make corrections for the motion of the Earth. Omitting such corrections will result in the "discovery" of a planet which is actually the Earth... [[User:Sabik|Sabik]] ([[User talk:Sabik|talk]]) 04:31, 19 January 2014 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">;Title text</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">The explain for the title text is still incorrect. The telescope looking at US is not the mirror messing the astronomer! --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 18:45, 10 August 2014 (UTC)</ins></div></td></tr>
</table>Dgbrthttps://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=58101&oldid=prevSabik: Dopler spectroscopy2014-01-19T04:31:01Z<p>Dopler spectroscopy</p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>::[http://pastebin.com/wX9j6X3Y I've translated it.] --[[User:Kronf|Kronf]] ([[User talk:Kronf|talk]]) 12:55, 2 August 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>::[http://pastebin.com/wX9j6X3Y I've translated it.] --[[User:Kronf|Kronf]] ([[User talk:Kronf|talk]]) 12:55, 2 August 2013 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Exoplanet detection techniques like Doppler spetroscopy have to make corrections for the motion of the Earth. Omitting such corrections will result in the "discovery" of a planet which is actually the Earth... [[User:Sabik|Sabik]] ([[User talk:Sabik|talk]]) 04:31, 19 January 2014 (UTC)</ins></div></td></tr>
</table>Sabikhttps://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=45651&oldid=prevKronf at 12:55, 2 August 20132013-08-02T12:55:21Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Please translate this. It's a great joke, but most people here will not understand. And: It's not a newspaper.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:31, 10 July 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Please translate this. It's a great joke, but most people here will not understand. And: It's not a newspaper.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:31, 10 July 2013 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>::That was already the main part of the joke. If someone is interested in the rest, please use your favorite online translator. (Claiming to be a "newspaper" is also a joke, the same as claiming to exist since 1845) --[[User:Chtz|Chtz]] ([[User talk:Chtz|talk]]) 10:35, 11 July 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>::That was already the main part of the joke. If someone is interested in the rest, please use your favorite online translator. (Claiming to be a "newspaper" is also a joke, the same as claiming to exist since 1845) --[[User:Chtz|Chtz]] ([[User talk:Chtz|talk]]) 10:35, 11 July 2013 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">::[http://pastebin.com/wX9j6X3Y I've translated it.] --[[User:Kronf|Kronf]] ([[User talk:Kronf|talk]]) 12:55, 2 August 2013 (UTC)</ins></div></td></tr>
</table>Kronfhttps://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=43479&oldid=prevChtz at 10:35, 11 July 20132013-07-11T10:35:57Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>A German (satirical) newspaper page had an article once, how NASA discovered a habitable planet zero light years away from Earth after they rotated the Hubble space telescope [http://www.der-postillon.com/2012/02/nasa-entdeckt-bewohnbaren-planeten-in.html]. --[[User:Chtz|Chtz]] ([[User talk:Chtz|talk]]) 22:18, 10 July 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>A German (satirical) newspaper page had an article once, how NASA discovered a habitable planet zero light years away from Earth after they rotated the Hubble space telescope [http://www.der-postillon.com/2012/02/nasa-entdeckt-bewohnbaren-planeten-in.html]. --[[User:Chtz|Chtz]] ([[User talk:Chtz|talk]]) 22:18, 10 July 2013 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Please translate this. It's a great joke, but most people here will not understand. And: It's not a newspaper.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:31, 10 July 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Please translate this. It's a great joke, but most people here will not understand. And: It's not a newspaper.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:31, 10 July 2013 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">::That was already the main part of the joke. If someone is interested in the rest, please use your favorite online translator. (Claiming to be a "newspaper" is also a joke, the same as claiming to exist since 1845) --[[User:Chtz|Chtz]] ([[User talk:Chtz|talk]]) 10:35, 11 July 2013 (UTC)</ins></div></td></tr>
</table>Chtzhttps://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=43435&oldid=prevDgbrt at 22:31, 10 July 20132013-07-10T22:31:14Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>A German (satirical) newspaper page had an article once, how NASA discovered a habitable planet zero light years away from Earth after they rotated the Hubble space telescope [http://www.der-postillon.com/2012/02/nasa-entdeckt-bewohnbaren-planeten-in.html]. --[[User:Chtz|Chtz]] ([[User talk:Chtz|talk]]) 22:18, 10 July 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>A German (satirical) newspaper page had an article once, how NASA discovered a habitable planet zero light years away from Earth after they rotated the Hubble space telescope [http://www.der-postillon.com/2012/02/nasa-entdeckt-bewohnbaren-planeten-in.html]. --[[User:Chtz|Chtz]] ([[User talk:Chtz|talk]]) 22:18, 10 July 2013 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">:Please translate this. It's a great joke, but most people here will not understand. And: It's not a newspaper.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:31, 10 July 2013 (UTC)</ins></div></td></tr>
</table>Dgbrthttps://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=43431&oldid=prevChtz at 22:18, 10 July 20132013-07-10T22:18:54Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>: Depends on how far the aliens decide to put the mirror. Light gets weaker with distance, which is the same reason that distant stars (many of which are brighter than our sun) don't overwhelm us with light. Also...what if the sun is merely a reflection of something? [[Special:Contributions/174.88.153.125|174.88.153.125]] 16:28, 29 June 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>: Depends on how far the aliens decide to put the mirror. Light gets weaker with distance, which is the same reason that distant stars (many of which are brighter than our sun) don't overwhelm us with light. Also...what if the sun is merely a reflection of something? [[Special:Contributions/174.88.153.125|174.88.153.125]] 16:28, 29 June 2013 (UTC)</div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">A German (satirical) newspaper page had an article once, how NASA discovered a habitable planet zero light years away from Earth after they rotated the Hubble space telescope [http://www.der-postillon.com/2012/02/nasa-entdeckt-bewohnbaren-planeten-in.html]. --[[User:Chtz|Chtz]] ([[User talk:Chtz|talk]]) 22:18, 10 July 2013 (UTC)</ins></div></td></tr>
</table>Chtzhttps://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=43419&oldid=prevCoderLass at 21:14, 10 July 20132013-07-10T21:14:12Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Since when do we have terrestrial telescopes that can directly resolve exoplanets? I think we're still at the stage where we get excited by troughs in light curves EDIT: TIL that there are specific techniques for exactly that: {{w|Nulling interferometry}} and {{w|Vortex coronagraph}}s. Still, they may work for hot Jupiters, but don't think we can detect Goldilocks exoplanets from the ground yet; much less see oceans and visible weather. [[Special:Contributions/220.224.246.97|220.224.246.97]] 09:14, 28 June 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Since when do we have terrestrial telescopes that can directly resolve exoplanets? I think we're still at the stage where we get excited by troughs in light curves EDIT: TIL that there are specific techniques for exactly that: {{w|Nulling interferometry}} and {{w|Vortex coronagraph}}s. Still, they may work for hot Jupiters, but don't think we can detect Goldilocks exoplanets from the ground yet; much less see oceans and visible weather. [[Special:Contributions/220.224.246.97|220.224.246.97]] 09:14, 28 June 2013 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">::You can't detect them from the ground, but you are invited use your pattern-recognition skills to detect planets by examining the images sent back by the Kepler telescope. It's part of the citizen-scientist project. Go to  http://www.PlanetHunters.org .[[User:CoderLass|CoderLass]] ([[User talk:CoderLass|talk]]) 21:14, 10 July 2013 (UTC)</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>My first thought was that you need to point the mirror so that it's aimed perfectly at the Earth. Then, I realized that you can use a corner reflector so that the aim doesn't have to be precise at all. Then, I came to the following realization: what if a significant portion of the stars we see are simply reflections of our own solar system due to a massive prank done by aliens? [[Special:Contributions/174.88.153.125|174.88.153.125]] 15:22, 28 June 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>My first thought was that you need to point the mirror so that it's aimed perfectly at the Earth. Then, I realized that you can use a corner reflector so that the aim doesn't have to be precise at all. Then, I came to the following realization: what if a significant portion of the stars we see are simply reflections of our own solar system due to a massive prank done by aliens? [[Special:Contributions/174.88.153.125|174.88.153.125]] 15:22, 28 June 2013 (UTC)</div></td></tr>
</table>CoderLasshttps://www.explainxkcd.com/wiki/index.php?title=Talk:1231:_Habitable_Zone&diff=42577&oldid=prev24.72.12.221 at 13:46, 1 July 20132013-07-01T13:46:18Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:For this trick to work, the mirror would need to be placed AT LEAST two light years away and be at least 1AU big. Somehow I don't think this is worth it. Alternatively, you need more complicated optical system which would not only mirror Earth, but also create illusion it's further away. I still think such system would be more costly to build that ISS. Or ... well ... you could put an LCD display directly over the telescope. That's doable, cheap and as a bonus you can display planets from sci-fi there. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 08:44, 28 June 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:For this trick to work, the mirror would need to be placed AT LEAST two light years away and be at least 1AU big. Somehow I don't think this is worth it. Alternatively, you need more complicated optical system which would not only mirror Earth, but also create illusion it's further away. I still think such system would be more costly to build that ISS. Or ... well ... you could put an LCD display directly over the telescope. That's doable, cheap and as a bonus you can display planets from sci-fi there. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 08:44, 28 June 2013 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">::The mirror could be much smaller and closer if it's convex. PS. I don't know the 'rules' for posting, so apologies if I'm doing it wrong.[[Special:Contributions/24.72.12.221|24.72.12.221]] 13:46, 1 July 2013 (UTC)</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>::Under Hkmaly's initial proposal, the astronomer would have to make two observations, 4 years apart, in order to see the "other" telescope. [[User:Elsbree|Elsbree]] ([[User talk:Elsbree|talk]]) 07:13, 29 June 2013 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>::Under Hkmaly's initial proposal, the astronomer would have to make two observations, 4 years apart, in order to see the "other" telescope. [[User:Elsbree|Elsbree]] ([[User talk:Elsbree|talk]]) 07:13, 29 June 2013 (UTC)</div></td></tr>
</table>24.72.12.221