Earth’s gravity has a lot to do with what people think is up and what is down. Things fall down toward the ground, but that ...

Humans were not designed for space. Ironically, because we insist on going there anyway, scientists now know from studying astronauts that the lack of Earth’s gravity can wreak health havoc, such as ...

Reentry occurred Wednesday (March 11) at 6:37 a.m. EDT, NASA officials said. When you purchase through links on our site, we ...

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Why does Pluto's orbit take so long? Pluto's orbit is not like those of the eight major planets, which are relatively circular. Instead, it is highly elliptical and tilted. At tim ...

Pluto has not completed a single orbit since its 1930 discovery. With a 248-year journey around the Sun, the dwarf planet will finish its first full circuit in 2178.

Skywatchers have an unusual opportunity this weekend to observe six planets positioned so they rise above the horizon at the same time. Often called an planetary parade, the event will appear just ...

Astronomers have uncovered a distant planetary system that flips a long-standing rule of planet formation on its head. Around the small red dwarf star LHS 1903, scientists expected to find rocky ...

A newly identified planet candidate, HD 137010 b, looks strikingly Earth-like in size and orbit — but it may be colder than Mars due to its dimmer star. If it has a thick enough atmosphere, though, ...

Astronomers have long been puzzled by the near-absence of planets orbiting close pairs of stars. New theoretical work shows that subtle relativistic effects can slowly drive such planets into extreme, ...

In a sense, this whole thing was inevitable. Elon Musk and his coterie have been talking about AI in space for years — mainly in the context of Iain Banks’ science-fiction series about a far-future ...

Why is it so rare to find exoplanets orbiting two stars, also called circumbinary planets (CBPs)? This is what a recent study published in The Astrophysical Journal Letters hopes to address as a team ...