Our understanding about the universe and our place in it has changed over time.
A newfound alien planet is one for the record books.
Less than a year from now, NASA's New Horizons spacecraft will make the first-ever visit to Pluto, potentially revolutionizing scientists' understanding of the dwarf planet.
WASHINGTON For the first time in history, humanity is within reach of finding Earth-like planets where life exists, but these extraterrestrials may not take the form of intelligent beings,...
A NASA probe that's expected to leave the solar system after it finishes its mission at Pluto and beyond will carry a message intended for any alien life-form that comes across it in the far future.
Astronomers aren't being poetic when they say this star is a diamond.
Scientists are as giddy as an enchanted snowman, as summer solstice approaches on Titan, Saturn's largest moon
Scientists have just discovered the "Godzilla of Earths" — a new type of huge and rocky alien world about 560 light-years from Earth.
There are more than 170 moons in our solar system, but a few stand out.
Now we’re detecting dozens of exoplanets within the habitable zones of their stars — and even one world that has similar characteristics as Earth — the next big question will be: do any of these...