Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s hiding in plain sight just a few billion miles behind Neptune. Published last month in ...

"Are we alone?" This ancient question has occupied humanity's mind for a long time. In 1995, the discovery of the first ...

NASA has just announced a groundbreaking discovery: 10 new Earth-like planets beyond our solar system that could potentially ...

151; -- Astronomers on Monday reported the discovery of an Earth-like planet outside the solar system whose size and distance from its own star put it in the "habitable" zone and make for a ...

This artist's concept depicts one possible appearance of the planet Kepler-452b, the first near-Earth-size world to be ... It is a G2-type star like our sun, with nearly the same temperature ...

Related: Mysterious radio signal from Proxima Centauri was definitely not aliens Proxima b: Closest Earth-like planet discovery in pictures The team modeled what a hypothetical rocky planet in the ...

But no other Earth-like planet outside our solar system is as close to humans and their observatories as this new world, making it the best possible hunting ground for living organisms.

New estimates and calculations suggest that there are even more Earth-like planets and ocean worlds in our galaxy than previously known, according to new research published this week. So far ...

We now know that our nearest neighbor, Proxima Centauri, is host to at least two planets ... and non-volatile elements (like iron and silicon) in the Sun and the Earth and looked at how the ...

Freelance writer Amanda C. Kooser covers gadgets and tech news with a twist for CNET. When not wallowing in weird gear and iPad apps for cats, she can be found tinkering with her 1956 DeSoto.

Our series on The Science of Siblings, examines how these two planets started out so similar but end up so different. Earth may seem like a one-of-a-kind planet, but it actually has a twin.

Some researchers now propose that these irregularities could indicate the presence of an undiscovered Earth-like planet. The ...