Anniversary of the Mount St. Helens eruption

On May 18, 1980, Mount St. Helens erupted in a deadly explosion, collapsing one side of the mountain and killing 57 people.

Earliest evidence of humans changing their world with fire

Stone Age artifacts excavated near the shores of Lake Malawi in eastern Africa, combined with evidence drawn from the lakebed itself, provides the earliest evidence of ancient humans using fire to enhance their world.

Omega Centauri is the Milky Way’s largest star cluster

The Milky Way’s largest globular star cluster, Omega Centauri, contains about 10 million stars, but probably no life.

Off Japan’s coast: An ancient animal symbiosis comes back to light

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

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New clues to ancient life from billion-year-old lake fossils

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.

Listen: Have aliens already visited us?

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.

Why is Mars sometimes bright and sometimes faint?

Sometimes Mars is bright like a dot of flame. Other times, as in May 2021, Mars appears inconspicuous among the brighter stars. Why?

Warming is clearly visible in new US climate normals

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.

Arcturus, brightest star of the north

Arcturus is the 4th brightest star in the sky and the brightest star north of the celestial equator. One of the easiest stars to locate due to its position off the handle of the Big Dipper, you can look for it on spring evenings in the Northern Hemisphere.

See a nova or “new” star. V1405 Cas is now visible to the eye

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

New type of aurora revealed in 19-year-old video

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.

Sharks navigate using Earth’s magnetic field

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

Voyager 1 detects a hum in interstellar space

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.