That acronym you learned to memorize the order of the planets has led you astray.
Earth’s magnetic field nearly collapsed about 565 million years ago, but the planet’s core froze solid and saved it in the nick of time, a new study suggests.
A collision with a Mars-like planet could have given Earth the ingredients it needed for life to form.
Ocean temperatures reached their highest point since accurate measurements first began in the 1950s.
Billions of years ago, molecules on a lifeless and tumultuous Earth mixed, forming the first life-forms.
One of Hawking's earliest surviving wheelchairs and his groundbreaking doctoral thesis are up for auction in London.
Dark energy may be decreasing, which puts a crimp in the notion that the universe will expand forever.
Hurricane Florence caused huge problems with pollution and runoff in rivers, which these stark NASA images reveal.
The signal extends over a huge swath of space, an area that's 2.5 times bigger than the orbit of Pluto.