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 ...

Researchers from MIT have located a lava-filled world about 700 light-years away that’s 40 times closer to its star than Mercury is to our sun. It’s considered one of the shortest orbital periods ...

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 ...

Scientists following up on data from the Kepler planet-hunting telescope have identified Earth’s closest twin yet—at least in terms of size and mass. Measuring only 1.2 times the radius of Earth, ...

The bad news is it's too hot for humans. The planet - known as Kepler 78b - was named after its sun-like star, Kepler-78 which is about 20 per cent bigger than the sun. It has an orbit of about 8.5 ...