Proctor/J. Pollard A quartet of Earth-like worlds, each about 20% to 30% the size of our planet, circle one of our closest ...

Last year, astronomers announced that a planet orbits Barnard’s star. Now, researchers have confirmed the existence of three more.

Earth is our home planet, and it's the only place in the universe where we know for certain that life exists. Earth formed over 4.5 billion years ago from a swirling cloud of gas and dust squished ...

SEE ALSO: Stop describing a planet as 'Earth-like' unless it really is This ... like burning of fossil fuels -- that would be pretty cool," Howell said. "Those would be things that you'd have ...

It's not the crash-boom that would devastate Earth, but what would come after. Such an impact would release 100 to 400 million metric tons of dust into the planet's atmosphere, the researchers ...