A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

Scientists with NASA announced they have discovered an Earth-sized planet that is likely rocky – and could be habitable. The planet, named TOI 700 e, is slightly smaller than Earth and ...

Their telescopes, on the ground and in space, tend to focus on planets much larger than Earth, in part because they're easier ...

Discover interesting facts about how the moon formed, what it's made out of, and the many missions humans have launched to ...

A second, smaller planet might be nearby that measures only slightly bigger than Earth and it, too, might dwell inside the “conservative” habitable zone, NASA reported, saying the planet ...

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The lone planet confirmed to be in the system is squeezed in between the two, orbiting at a distance similar to Earth's ...

The three other potential planets orbiting Barnard's star all apparently are rocky and smaller than Earth, ranging from 20-30% of Earth's mass. The hope is that at least one of these may be in the ...

An international team of astronomers claim to have discovered a 'super-Earth' that's bigger than our own blue planet but smaller than Neptune. A new paper, published in the journal, Science has ...

A massive "planet killer" asteroid will make ... a hazard 2011 UL21 is likely at least 10 times smaller than the largest space rock to ever hit Earth, the Vredefort asteroid, and around five ...