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Uncertainty is inherent to our Universe.

There might be a hard limit to our knowledge of the Universe.

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?

As far as we can tell, there's no limit to how far it goes on; only a limit to how far we can see. Could the Universe truly be infinite?

We can't go back to the Big Bang, nor ahead to the heat death of the Universe. Nevertheless, here are today's natural temperature extremes.

Nobel Laureate Roger Penrose, famed for his work on black holes, claims we've seen evidence from a prior Universe. Only, we haven't.

When the hot Big Bang first occurred, the Universe reached a maximum temperature never recreated since. What was it like back then?

While humanity has been skywatching since ancient times, much of our cosmic understanding has come about only recently. Very recently.

Generations ago, cosmologists asserted that the Universe might not just be the same in all directions, but at all times. But is that true?

For the first time, astronomers have created a data-driven estimate for how many black holes are in our Universe: more than anyone expected.

Everything you ever wanted to know about the Universe, explained by physicist Sean Carroll.

Science will lead us to a universal morality and a cosmic religion.

A spherical structure nearly one billion light-years wide has been spotted in the nearby Universe, dating all the way back to the Big Bang.

Cosmologists are largely still in the dark about the forces that drive the Universe.

With ~400 billion stars in the Milky Way and 6-20 trillion galaxies overall, that makes for a lot of stars. But not as many as you'd think.

A University of Oxford professor explains how conscious machines are possible.

Ultracold gases in the lab could help scientists better understand the universe.

The Universe isn't as "clumpy" as we think it should be.

We may be the last generation born not knowing if we are alone in the Universe.

The visible Universe extends 46.1 billion light-years from us, while we've probed scales down to as small as ~10^-19 meters.

Hubble showed us what our modern day Universe looks like. JWST's big goal was to teach us how the Universe grew up. Here's where we are now.

By studying the dwarf galaxy Wolf-Lundmark-Melotte ~3 million light-years away, JWST reveals the Universe's star-forming history firsthand.

As time goes on, dark energy makes distant galaxies recede from us ever faster in our expanding Universe. But nothing truly disappears.

Just by observing the tiny amount of deuterium left over from the Big Bang, we can determine that dark matter and dark energy must exist.

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?"

How scientists are hearing the gravitational background "hum" of the Universe for the very first time.

Use words with plosives and affricates if you really want to make sure everyone knows you mean business.

The hot Big Bang is often touted as the beginning of the Universe. But there's one piece of evidence we can't ignore that shows otherwise.

How scientists found out that we live in a cosmic aquarium.

Not even Einstein immediately knew the power of the equations he gave us.