Add Yahoo as a preferred source to see more of our stories on Google. Mercury, the closest planet to the sun, is only slightly larger than Earth's moon and is pockmarked with craters. The planet is ...

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NASA's Messenger probe is set to make history tomorrow night (March 17), when — if all goes well — it will become the first spacecraft ever to enter into orbit around the planet Mercury. Subscribe to ...

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Astronomy Space.com headlines crossword quiz for week of Feb. 2, 2026: What type of object is C/2026 A1 (MAPS)? Astronomy Space.com headlines crossword quiz for week of Jan. 26, 2026: Which planet may ...

The planet closest to the Sun may be small in stature, but it’s full of surprises. National Corporate funding for NOVA is provided by Carlisle Companies. Major funding for NOVA is provided by the NOVA ...

Mercury, the closest planet to the sun, is only slightly larger than Earth's moon and is pockmarked with craters. The planet is visible to the unaided eye and as such as has long been known to humans.