Scientists have found a surprising modern-day symbiosis between 2 undersea animals, which had been gone from the fossil record for 270 million years.

With an unobstructed horizon in the direction of sunset, there's a good chance that'll you spot Mercury with the eye alone in mid-May 2021. Look for it above bright Venus in the west, an hour or so after the sun goes down.

We think of earthly life as evolving from the sea. But newly discovered microscopic "ball" fossils - found in ancient lake sediments in Scotland - suggest that evolution from single-celled to multicellular organisms might have occurred in lakes.

A podcast featuring Harvard theoretical physicist Avi Loeb, on the subject of whether 'Oumuamua - the strange object that swept through our solar system in 2017 - is an artifact of an alien intelligence.

Climatologists at NOAA have released updated climate "normals." They explain what "normal" means, how our U.S. climate normals have changed, and how to best make sense of them.

The brightest planet Venus has now returned to the evening sky, joining Mercury. It'll surprise you by appearing so bright, low in the western twilight. The moon swept past Venus Wednesday and Mercury Thursday ... this weekend, Mars!

A nova that first brightened in March of 2021 has now flared bright enough to be seen without binoculars or a telescope.

Scientists call it a "diffuse auroral eraser." That's because this newly named aurora first appears as a bright stripe over a diffuse auroral background. Then, when it disappears, it scrubs out the faint auroral light behind it.

Longstanding mystery solved! New research shows that - just as lobsters, turtles and some birds do - sharks navigate using Earth's magnetic field,

Now 8 years into its travels in the deep reaches of space between the stars, Voyager 1 has detected a faint, low-level hum. It stems from the vibration of the plasma, or ionized gas, in interstellar space.