Earth's shape can be tested in surprisingly simple ways without relying on space photographs. The strongest part of the ...

Earth and Mars may be close neighbors today, but scientists say the two planets took different routes during their formation.

Earth and Mars formed about 4.5 billion years ago from the same swirling cloud of gas and dust. But a new study suggests ...

This fossil collection reveals a completely different version of Earth, where ancient oceans covered continents and strange life forms dominated the planet. Each fossil represents a moment in deep ...

Earth and Mars may have formed through different mixtures of planetary building processes, despite developing side by side.

Earth and Mars emerged from the same young solar system around 4.5 billion years ago, yet they may have been assembled ...

Three billion years ago, Earth was a very different place. The sun that shone on its oceans and continents was not as bright as it is today, and rather than the oxygen-rich atmosphere humans need to ...

This artist’s rendition shows a giant impact similar to the one 4.5 billion years ago that scientists think created the Earth-Moon system. Courtesy of NASA/JPL-Caltech Every hero needs an origin story ...

Four and a half billion years ago, Earth and Mars were born in the rotating cloud of gas and dust that would eventually ...