A new study that analyzed rock from deep within the Chicxulub impact crater helps reveal what happened within the first 24 hours after the asteroid impact that doomed the dinosaurs.

Safety guidelines for taking photos of the sun.

Today's sky chart shows you how to star-hop to the Andromeda galaxy - the large spiral galaxy next-door to our Milky Way - from the Great Square of Pegasus.

What is ULX-4 - a mystery green blob of X-ray light that appeared in the Fireworks Galaxy - and then soon disappeared again? A black hole or neutron star are 2 possibilities.

Carbon dioxide, CO2, makes up less than one-twentieth of 1% of Earth's atmosphere. How does this relatively scarce gas control Earth's thermostat?

STEVE, and the northern lights. Does it get any better than this?

"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.

If you're in the Northern Hemisphere, you can see the zodiacal light, or false dawn, at this time of year. If you're in the Southern Hemisphere, look for it after sunset.