Our solar system’s origin story spans billions of years and involves clouds of gas, cosmic collisions, and planetary ...

For instance, Neptune migrated outward, switching places with Uranus, and pushed a lot of the small, icy bodies into the ...

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

Learn how a possible ninth planet, the theoretical Planet X, could have acquired its wide orbit in the outer Solar System — a ...

People always want to know what will happen to Earth when the sun eventually swells up as a red giant. For one thing, the ...

but also certain characteristics of Earth and the other inner rocky planets, which would have formed later than the outer planets from a depleted supply of planet-forming material. Laughlin and ...

Inner planets are the four planets closest to the Sun: Mercury, Venus, Earth and Mars. They are collectively characterized by a solid surface and small size relative to the outer gas giants.

The presence of water-ice in the debris disk around a young star could have helped facilitate the growth and development of ...

But the liquid outer core is shrinking ... be obliterated as our sun expands into a red giant and swallows the inner planets of the solar system, Vidale said. Until then, scientists should ...

If the core froze relatively recently, the current thermal state at the inner core–outer core boundary indicates ... cores and magma oceans of rocky planets which facilitate habitable conditions ...