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

With its very first deep-field view of the Universe now released, the James Webb Space Telescope has shown us our cosmos as never before.

The upcoming launch of the James Webb Space Telescope is the event of a lifetime.

The highest-energy particles could be a sign of new, unexpected physics. But the simplest, most mundane explanation is particularly iron-ic.

Archaeologists can learn how societies lived by studying what they left behind when they died. Astronomers are doing much the same thing.

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

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.

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

Should we be searching for life on other planets, or technology?

With launch, deployment, calibration, and science operations about to commence, here are 10 facts that are absolutely true.

The James Webb Space Telescope finally could answer the age-old question of whether we are alone in the universe.

In 2022, Hubble owned the record for most distant galaxy. Today, that galaxy is down to the 9th most distant object. Thanks, JWST.

With a finite 13.8 billion years having passed since the Big Bang, there's an edge to what we can see: the cosmic horizon. What's it like?

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

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

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

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

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

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

At 1,600 light years away, the black hole is practically in our cosmic backyard.

Thanks to time-traveling telescopes, we can see more about the Big Bang

Big dreams and big telescopes are back at last, but everything depends on sufficiently funding NASA, the NSF, and the DOE.

Scientists can make substantial progress without fully understanding exactly what they're doing.

JWST's revolutionary views arrive in high-resolution at infrared wavelengths. Without NASA's Spitzer first, it wouldn't have been possible.

Ever since the Big Bang, cataclysmic events have released enormous amounts of energy. Here's the greatest one ever witnessed.

When we look out at the Universe, even with Hubble, we're only seeing the closest, biggest, brightest galaxies. Here's where the rest are.

In our Solar System, even the two brightest planets frequently align in our skies. But only rarely is it spectacularly visible from Earth.

Science continues to amplify our view of reality.

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

The standard model of cosmology has a big new problem: Some galaxies seem to be too old.