Keith Cooper

"The fall of Aguas Zarcas was huge news in the country. No other fireball was as widely reported and then recovered as stones on the ground in Costa Rica in the past 150 years."

Wrinkle ridges that formed in the past 160 million years suggest recent geological activity on the moon.

The climate on such a world must be beyond bizarre.

The simulations will be used by astronomers to test the standard model of cosmology.

Mars' global magnetic field may have hung around for 200 million years longer than scientists had thought, possibly giving life a longer window to take hold on the Red Planet.

The Taurid Meteoroid Stream, which is possibly responsible for the famous Tunguska and Chelyabinsk impacts, probably doesn't hide a civilization-killing asteroid.

The Hubble Space Telescope has seen Jupiter's Great Red Spot oscillating in width as it drifts around the planet. Could this be related to its overall shrinking?

China's Chang'e 5 mission brought back evidence that the moon had erupting volcanoes just 120 million years ago.

By using protons to probe how a magnetic field responds to an expanding plasma, experimenters have replicated the particle jets spewed out by active black holes.

Although no aliens were found, the results have helped constrain expectations of possible alien transmitter power.

A mysterious ring invisible at all wavelengths except radio could be a trace of a dramatically unstable star shedding its skin.

The Milky Way is warped, possibly as the result of a collision with another galaxy billions of years ago. Studying this warp could reveal more about the structure of our galaxy's hidden matter.

Seen for the first time from the ground, the polar rain aurora produced an eerie green glow captured on camera in Norway.

If there's life on Jupiter's moon Europa or Saturn's moon Enceladus, it could have a network of deep-sea hydrothermal vents to thank for its existence, new research suggests.

The X-ray-emitting binary system Cygnus X-3 features a massive star donating matter to a compact object, probably a black hole. That may explain its perplexing brightness.

This pit crater making recent headlines may open into a larger cave that could provide a sheltered environment for both astronauts and hypothetical Martian life.

Stars that vanish from the sky may be collapsing directly into black holes without going supernova first, a new study of a bizarre binary star system suggests.

NASA's Juno spacecraft has spotted the elusive fifth moon of Jupiter transiting the giant planet's Great Red Spot, giving astronomers a rare view of this small but intriguing natural satellite.

Flaring stars, black hole outbursts and gamma-rays are just some of the cosmic exotica that Einstein Probe will hunt for.

Submillimeter wavelength radio observations of the Southern Ring Nebula have identified that it's actually a double ring, shaped by the interactions of three stars.

The great planetary instability, which saw Jupiter and the other gas giants wander chaotically through the solar system, coincides with the collision that formed Earth's moon. Could the two events be linked?

Astronomers have taken the most detailed image of the Vela supernova remnant ever. The stunning, 1.3-gigapixel image is also the largest ever released from the Dark Energy Camera.

The James Webb Space Telescope zoomed in on galaxy GN-z11, which existed just 430 million years after the Big Bang, to reveal what may be some of the oldest stars in the universe.

We think the universe is 13.8 billion years old, but could we be wrong? A new study of bound galaxies offers an unexplored clue.

The Mars Express orbiter has detected enough water ice buried beneath the Red Planet's equator to cover the entire planet in a shallow ocean if melted.