Author: Lisa Grossman

Over more than a decade at Mars, the orbiter revealed how the solar wind strips away the planet’s atmosphere — and why the world lost

The debate could reopen in 2030 when NASA’s Europa Clipper spacecraft gets the closest view of the icy moon’s surface.

Scientists spotted patterns hours before a major solar flare, a discovery that could help forecast dangerous eruptions.

Neptune’s oddball moon Nereid may be the sole remnant of an earlier system, formed near the planet rather than being pulled in from afar.