A distant 'exomoon' the size of Jupiter is changing how we think about the cosmos.

We live in uninteresting times. Since the ructions that created the planets in the solar system’s first 100 million years (see “How was the solar system built?”) – and apart from an early migration of ...

Our solar system is a smashing success. A new study suggests that from its earliest period — even before the last of its nebular gas had been consumed — Earth’s solar system and its planets looked ...

Spiral Galaxy from Kirkland et al. CREDIT Chris Kirkland and colleagues. A new study of zircon crystals from two of Earth’s oldest continents indicates that the formation of Earth’s continental crust ...

Japan's MMX mission will blast off soon to collect Martian moon samples. The spacecraft will orbit Mars for three years and ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. An object has been discovered orbiting the sun far beyond ...

Add Yahoo as a preferred source to see more of our stories on Google. Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky ...

Diagrams of the solar system tend to give the planets top billing, lining them up in colorful rows while the star at the center serves as a backdrop. The real distribution of material tells a very ...

The assault on Terra was hiding something even larger. Ahriman’s forces seized a comet for a ritual that required the planets ...

Black holes about the size of a hydrogen atom could be careening through the solar system unnoticed. But their days of stealth may be numbered. Two teams of researchers propose methods to search for ...

Oh, we humans do love a cleanly defined boundary, don’t we? They make things easier, after all. If we’re trying to categorize something, knowing what labeled bin to put it in is handy. If we’re ...

When I was a kid, there were nine planets. Now we know of thousands! But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might ...