the Earth you walk on today might not be the same planet that was born 4.5 billion years ago. Many scientists believe that in its infancy, Earth collided with another world the size of Mars, and that ...

The formation of Mercury remains an unsolved mystery. The planet closest to the sun has a disproportionately large metallic core—accounting for about 70% of its mass—and a relatively small rocky ...

The first picture of a planet outside our solar system may actually depict a swirl of space dust, a new study suggests.

According to a recent study, published inScience Advances, the early Earth was formed astonishingly fast, but it wasn’t initially a planet capable of supporting life. The building blocks of biology, ...