"Even if a planet is in the habitable zone, if it has too small a water inventory, it transitions to an uninhabitable state." ...

Growing up, I was taught that there were nine planets in the solar system. That all changed in 2006, when the International ...

Exoplanets are planets located outside our solar system. They orbit distant stars ... Pictor’s original name was Equuleus Pictoris, meaning “the painter’s easel.” It’s now known by ...

The solar system is approximately 4.6 billion years old. Astronomers believe that roughly 100 million years into its existence, the planets first began to form in a rotating, flat cloud of gas ...