CAPE CANAVERAL, Fla. — Scientists have found a planet way out in the cosmos that’s close in size and content to Earth — an astronomical first. But hold off on the travel plans. This rocky world is so ...

CAPE CANAVERAL, Florida (Reuters) - For the first time, scientists have found a planet beyond the solar system that not only is the same size as Earth, but has the same proportions of iron and rock, a ...

This illustration compares our Earth with the newly confirmed lava planet Kepler-78b. Kepler-78b is about 20 percent larger than Earth, with a diameter of 9,200 miles, and weighs roughly 1.8 times as ...

The number of confirmed exoplanets, or worlds orbiting distant suns, shot past 1,000 last week, according to the semi-official Extrasolar Planets Encyclopedia. That’s pretty heady stuff considering ...

We’re just not all that special. At least that’s the consensus from scientists looking at data from a NASA mission to find “habitable” planets out there. The bottom line: one in five sun-like stars ...

Kepler 78b is a fiery planet with an orbit so much smaller than average that it may alter existing planetary theory. A team of scientists, including Harvard Lecturer in Astronomy David W. Latham, ...

Kepler-78b, a planet some 400 light-years away, is like hell on Earth. Astronomers described it this week as the first Earth-size planet that seems to be made of the same mixture of rock and iron as ...

CAPE CANAVERAL, Fla. - For the first time, scientists have found a planet beyond the solar system that not only is the same size as Earth, but has the same proportions of iron and rock, a key step in ...