User contributions
- 10:26, 13 April 2023 (diff | hist) . . (-6) . . 2762: Diffraction Spikes (Refractor telescopes (using only lenses) don't give refraction spikes, reflector telescopes (using mirrors) do.)
- 22:07, 5 December 2022 (diff | hist) . . (+97) . . 2707: Astronomy Numbers (→Explanation: 5.5kg=12.125lb - And I stated "kilogrammes" rather than "kilograms" because that's mostly aimed at helping non-US individuals using normal spelling.)