Moon phases refer to the changing appearances of the Moon as seen from Earth, driven by its 29.5-day orbit around our planet.
Comet 3I/ATLAS is the third known interstellar comet after 2017's 1I/'Oumuamua and 2019's 2I/Borisov. It was discovered on ...
Comet 3I/ATLAS will make its closest approach to Earth at 1 a.m. EST (0600 GMT) on Dec. 19. At that time, it will be about ...
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