Discover how scientists have used iron isotopes to determine the likely origin of the Mars-sized planet named Theia.

Small icy moons in the outer reaches of our solar system may hide boiling oceans underneath their surfaces, a new study finds ...

One fateful day about 4.5 billion years ago, a Mars-sized body called Theia collided with proto-Earth, turning both into a ...

The lack of clarity regarding the collision and the object that Earth collided with raised many questions, but they were ...

Space has a knack for bending our sense of scale. The Moon feels close enough to touch—after all, we see its craters with ...

Scientists finally weigh in on what it means to create life outside of Earth and what it would take to grow plants on other ...

There are several frozen moons in our solar system, orbiting the gas giants. Some of them, despite having temperatures that would make Antarctica feel tropical, have liquid water under the surface.

Your last chance to see a supermoon in 2025 is approaching quickly. December's full moon is scheduled to appear on Dec. 4, exactly one week after Thanksgiving. Even if you don't make plans to see it, ...

"At first glance, the bricks seem to be in good condition," said Zhou Yan, a scientist at Huazhong University of Science and ...