"We have never seen anything like this in the 24 years we have studied the supermassive black hole. It’s usually a pretty quiet, wimpy black hole on a diet. We don’t know what is driving this big feast."

It was exciting last week when scientists announced water vapor in a super-Earth's atmosphere. But, even as the announcement came, other scientists were cautioning that the planet - K2-18b - is probably less like a super-Earth and more like a mini-Neptune.

Astronomers now call recently-discovered flares from supermassive black holes in distant galaxies quasi-periodic eruptions. "Giant black holes regularly flicker like a candle but the rapid, repeating changes seen in GSN 069 from December onwards are something completely new," said one scientist.

Astronomers think the object they've labeled C/2019 Q4 - discovered August 30 - came from a place far, far away. If confirmed, it's only the 2nd interstellar object ever detected, after 'Oumuamua in 2017.

It's a huge bipolar gas structure, hundreds of light-years across, centered on our galaxy's center and near the galaxy's central supermassive black hole. Astronomers found it with the new, supersensitive MeerKAT telescope in South Africa.

It's a first-ever detection of water vapor in a super-Earth's atmosphere, orbiting in the habitable zone of its star, 110 light-years away. The discovery supports the possibility that our galaxy contains many such habitable worlds.

The lakes on Saturn's moon Titan are filled with liquid methane, not water, and some are surrounded by steep rims. A new study suggests these features might have been caused by explosions of warming nitrogen, which created Titan's lake basins long ago.

How much of what think you know about black holes is true, and how much is myth? To separate fact from fiction, check out this 4-minute vIdeo from NASA.

Chinese media have reported that the Yutu-2 rover has discovered a "gel-like" substance in a crater on the far side of the moon. It sounds intriguing, but details are still scarce.

The naming suggestions in a contest - which ran from last February to April - ranged from the scholarly to the silly, these scientists said. We think you'll like the winners.