Earth, between sweltering Venus and frozen Mars, formed and orbits within a band where water could persist in solid, liquid, and gaseous phases. Mars had surface water, but not as much as Earth, and ...

Scientists are reconsidering old information about Uranus. NPR's Scott Simon explains the problem with photos taken of the ...

SpaceX's Starship megarocket has come together ahead of its sixth-ever test flight next week. SpaceX has stacked Starship 's ...

Solar and cosmochemical data indicate high levels of carbon, nitrogen, and oxygen in the Sun. Researchers have unveiled a new ...