2062: Barnard's Star - Revision history

42.book.addict: Undo revision 364535 by 172.69.17.144 (talk) i don’t think you understand that it’s a red link

2025-02-05T04:17:08Z

Undo revision 364535 by 172.69.17.144 (talk) i don’t think you understand that it’s a red link

172.69.17.144: Undo revision 349491 by 42.book.addict (talk)

2025-02-05T03:04:26Z

Undo revision 349491 by 42.book.addict (talk)

BunsenH: gravitational influence

2024-11-16T22:44:14Z

gravitational influence

42.book.addict at 16:57, 27 August 2024

2024-08-27T16:57:05Z

Gtbot2007 at 15:37, 27 August 2024

2024-08-27T15:37:17Z

Nitpicking: /* Explanation */ missing word

2023-05-07T03:44:49Z

‎Explanation: missing word

Theusaf: Reverted edits by Donald Trump (talk) to last revision by CRLF

2022-05-26T19:57:13Z

Reverted edits by Donald Trump (talk) to last revision by CRLF

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Donald Trump: Reverted edit by anti-crap user

2022-05-26T19:04:45Z

Reverted edit by anti-crap user

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CRLF: Reverted vandalism with User:CRLF/OneClickUndo.js

2022-05-26T17:45:23Z

Reverted vandalism with User:CRLF/OneClickUndo.js

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Donald Trump: Reverted edit by anti-crap user

2022-05-26T17:24:39Z

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 Barnard's Star is the star with the greatest proper motion in the sky. Proper motion is motion in the sky other than that caused by Earth's rotation or orbit. Barnard's star is both very close to the sun (as these things go) and moving now at a speed of more than 140 km/s toward the Sun. It will make its closest approach to the Sun in approximately 10,000 years, at a distance of about 3.75 light-years.
-The image on the right shows different stars near the Sun over 100,000 years and it can be seen that none of them are getting closer than 3 light-years. This is a safe distance to our Solar System and the stars will not influence the orbits of the planets or smaller bodies. It's also obvious that much closer approaches never have happened since the Solar System formed 4.5 billion years ago because otherwise the nearly circular orbits of the planets in the same plane wouldn't be possible. Closer encounters have happened in the past by mostly small stars like {{w|Scholz's Star}} which actually passed through the {{w|Oort cloud}} at a distance of 0.82 light-years about 70,000 years ago, and at least one estimate suggests that a star is expected to pass through the Oort Cloud every 100,000 years or so. This distance is still too far away to influence the orbits of the planets, but those encounters cause {{w|Comet|comets}} perturbed from the Oort cloud to enter the inner Solar System roughly 2 million years later.
+The image on the right shows different stars near the Sun over 100,000 years and it can be seen that none of them are getting closer than 3 light-years. This is a safe distance to our Solar System and the stars will not measurably influence the orbits of the planets or smaller bodies. It's also obvious that much closer approaches never have happened since the Solar System formed 4.5 billion years ago because otherwise the nearly circular orbits of the planets in the same plane wouldn't be possible. Closer encounters have happened in the past by mostly small stars like {{w|Scholz's Star}} which actually passed through the {{w|Oort cloud}} at a distance of 0.82 light-years about 70,000 years ago, and at least one estimate suggests that a star is expected to pass through the Oort Cloud every 100,000 years or so. This distance is still too far away to measurably influence the orbits of the planets, but those encounters cause {{w|Comet|comets}} perturbed from the Oort cloud to enter the inner Solar System roughly 2 million years later.  (Given Neptune's mass of 5.149x10<sup>-5</sup> solar masses vs. Scholz's Star's mass of 0.15 solar masses, and Neptune's orbital radius of 30.1 AU vs. the star's closest-approach distance of about 52,000 AU, the star's gravitational influence on the inner solar system was only 9.8x10<sup>-4</sup> times that of Neptune.)
 The comic shows the sizes and the distances not in a proper scale. If the Sun was 1.4 cm (1.4 Mio km in real) in diameter, Barnard's Star would be less than 3 mm at a distance of 356 km. Even Jupiter wouldn't fit into this picture -- at ten times smaller than the Sun, it would be a few pixels, but at a distance of 7.8 m to the Sun and all the other planets would fit into a circle less than 100 meters in diameter. The distances to others stars are far beyond human imagination and at its closest distance a message still takes 3.75 years from Barnard's Star to the Sun.

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