The massive, violent flares are now known to emerge every 100 years—40 to 50 times more often than scientists once believed.

This year, private space companies were put to the test. Some thrived under pressure, while others crashed and burned.

TRAPPIST-1 b is one of seven rocky planets orbiting the star TRAPPIST-1, located 40 light-years away. The planetary system is ...

The northern lights may be visible in the northernmost U.S. states Monday night as the forecast looks to strengthen Tuesday.