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Within the next few decades, we may well have hard evidence for the existence of alien life on worlds light-years distant from Earth.

The discovery calls into question the few things scientists know about these powerful astronomical phenomena.

The TRAPPIST-1 system is a treasure trove of possibilities and questions. Observations by JWST have just begun.

With its first view of a protoplanetary disk around a newly forming star, the JWST reveals how alone individual stellar systems truly are.

Back in the 1930s, Fritz Zwicky postulated the existence of dark matter. No one took it seriously until Vera Rubin’s work: 40 years later.

Earth is the Solar System’s only known inhabited planet. Could Venus, if its phosphine signal is real, be our second world with life?

Experts answer 10 big questions about the nightmare scenario that could send us back to the pre-Space Age.

As Marcel Proust said, “The real voyage of discovery… consists not in seeking new landscapes, but in having new eyes.”

The Hubble Space Telescope, 32 years after its launch, broke the all-time record for most distant star. It won’t do better.

The race to find dark matter could grow more complex with high-energy neutrino interference.

The farther away they get, the smaller distant galaxies look. But only up to a point, and beyond that, they appear larger again. Here’s how.

Many planets will eventually be devoured by their parent star. For the first time, we caught a star in the act, eating its innermost planet!

Finding this missing piece of water’s path through the universe offers clues to how it came to be on Earth.

Professional astronomy images are the gold standard. But this Large Magellanic Cloud composite is the amateur community’s best image ever.

The last 70 years have taken us farther than the previous 70,000. But can we accomplish more than creating a record saying, “We were here?”

Pluto failed to meet the definition of a planet, but some astronomers think there might be a legitimate Planet 9 out there.

Even with only 12.5 hours of exposure time, James Webb’s first deep-field image taught us lessons we’ve never realized before.

When the Hubble Space Telescope first launched in 1990, there was so much we didn’t know. Here’s how far we’ve come.

Though a single measurement is not enough to definitively decide the debate, this is a major win for dark matter proponents.

After 15 years of monitoring 68 objects known as millisecond pulsars, we’ve found the Universe’s background gravitational wave signal!

Many galaxies really are ultra-distant, but some are just intrinsically red or dusty. Only with spectroscopy can JWST tell which is which.

SETI is no longer just a guessing game.

Artificial intelligence is much more than image generation and smart-sounding chatbots; it’s also a Nobel-worthy endeavor rooted in physics!

After decades of development, whether NASA’s Webb succeeds or fails all comes down to five critical milestones that are only days away.

Once science operations begin for James Webb, we’ll never look at the Universe the same way again. Here’s what everyone should know.

From black holes to dark energy to chances for life in the Universe, our cosmic journey to understand it all is just getting started.

Observations of an enormous cosmic structure, dubbed the “Big Ring,” seem to violate the Copernican principle.

For many, it was just a successful launch like any other. But for scientists around the globe, it was a victory few dared to imagine.

With launch costs dropping and enormous numbers of new satellites filling the sky, can’t we just do it all from space?

Even after the first stars form, those overdense regions gravitationally attract matter and also merge. Here’s how they grow into galaxies.