Keith Cooper

A century ago, humans didn't know other galaxies existed. Here's how Edwin Hubble changed that view.

The shells of carbon-rich dust are expanding outward into space at the breakneck velocity of 1,600 miles per second.

The International Space Station is always falling, yet it never crashes to Earth or burns up in our atmosphere. How is this possible?

Dark matter, antimatter, W bosons and neutron lifetimes all feature in our top 10 stories.

An object that orbits in the space between Jupiter and Neptune has chemistry that could tell us more about the birth of the solar system.

An ancient exoplanet dated at 12.7 billion years old could have formed over a long period in a giant disk of gas, according to new JWST observations.

Astronomers just took a big step toward a better understanding of white dwarfs, a discovery that could shed light on mysterious dark matter.

By doubling the number of known "dark comets," astronomers have been able to split them into two camps depending on their location in the solar system.

New measurements from NASA's Juno probe have seemingly put to bed the possibility of a magma ocean beneath the surface of Io.

Warmth on sunny days could be a major trigger for instigating dust storm activity on Mars.

NASA is developing autonomous software to recognize faults and hazards on worlds like Europa, and prevent or fix them without having to await commands from Earth.

Main-belt comets that scientists keep finding could provide new insights into the birth of our solar system.

A new frontier has been reached in simulations of the universe, with the powerful exascale supercomputer called "Frontier" performing the most detailed simulation yet of the cosmos.

Voyager 1 is shouting across the cosmos again, following a glitch that had seen it inadvertently switch to its low-power transmitter.

The bacteria could be grown in space, and lend their photosynthesizing talents to supplying power to the hundreds of thousands of satellites in orbit.

Whichever mission NASA selects to image the cosmos next should launch by 2032. Here are the two contenders.

Magnetic vortices twisting down from Jupiter's ionosphere into its deep atmosphere cause giant, ultraviolet-absorbing polar anticyclones, each the size of our Earth.

A new theory proposes that Phobos and Deimos resulted from the wreckage of a larger asteroid that wandered too close to Mars and was ripped apart.

A brand-new James Webb Space Telescope image captures the steady, slow lifestyle of the distinctive Sombrero Galaxy.

Space mysteries In microgravity, astronauts must measure their mass, not their weight, which they can do with two devices on the ISS.

Though data from all modern missions is digitized and properly archived, the same can't be said for missions prior to 1990.