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 its water. More

New observations suggest the supermassive black hole at the Milky Way’s core is blowing gas away from the central behemoth. More

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

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. More

At some 60 billion times the mass of the sun, this dark void could be home to a pair of black holes that are due for a cosmic collision. More