Astronomers believe they may have uncovered evidence of a hidden Earth -size planet lurking in the outer solar system. Dubbed “Planet Y”, the proposed world could be nearly twice as close to Earth as ...

Flat Earthers have travelled to Antarctica and even attempted to fly in homemade rockets in their quest to prove the world is ...

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On this week’s “More To The Story,” environmentalist Bill McKibben examines how the remarkable rise of solar power could ...

A low-density, puffy planet orbiting relatively far from a young star in a nearly perpendicular orbit. What's going on?

"With these probability maps, we can push asteroids away while preventing them from returning on an impact trajectory, ...

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

The mysterious interstellar comet 3I/ATLAS is absolutely blasting out water at a staggering rate, astronomers found.

Planets that orbit white dwarf stars should be too hot to host alien life, theories suggest. But a new study accounting for ...

Just as Earth orbits the sun, most planets discovered beyond our solar system orbit a host star. But some are out there all ...