The universe

Astronauts placed six different American flags on the moon during the Apollo program. What became of those flags in the years since, and why were they controversial?

The European Space Agency has released an audio-visual representation of solar activity over the last three years, using data from the Solar Orbiter probe.

The weird outbursts of a distant supermassive black hole may be caused by a death-defying white dwarf walking a cosmic tight rope around it.

China's Chang'e 7 moon-landing mission will apparently include a flag that can flutter in the moon's thin and tenuous atmosphere.

Astronomers are now confident the Event Horizon Telescope can help them decode elusive origins of black hole jets.

Satellite images show destruction caused by huge, fast-moving fires raging this week in Southern California.

Scientists want to know if a tidal disruption event that exploded twice is the result of a star abandoning its binary partner, allowing it to be devoured by a supermassive black hole.

The spacecraft themselves continued to operate normally in Earth orbit during the outage and "no science data has been lost."