When you spend more than $1 billion on a spacecraft, it can be a nervous wait to see if everything pays off. But if and when it does, the results can be rather glorious. And NASA’s Juno spacecraft has ...

Hydrogen is the most abundant element in the universe, and a major component of stars such as the Sun, as well as gas-giant planets such as Jupiter and Saturn. In recent years, hydrogen’s behavior at ...

"Tidal heating plays an important role in the heating and orbital evolution of celestial bodies," said Alex Hayes, professor of astronomy. "It provides the warmth necessary to form and sustain ...