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 ...

Uranus's upper atmosphere has been cooling for decades—and now scientists have shown why. Observations from Earth have shown ...

Some minerals in lava could suggest water is nearby.

potentially transforming theories about the solar system’s formation and guiding future astronomical missions. Solar and ...