It started with a bang, but won't end with one. Instead, it will "rage against the dying of the light" like nothing you've ever imagined.

At all distances, the Universe expands along our line-of-sight. But we can't measure side-to-side motions; could it be rotating as well?

Modern cosmology conjectures different possible fates for the Universe and thus for the end of time. Details depend on which model is right.

The Universe is expanding, and the Hubble constant tells us how fast. But how can it be a constant if the expansion is accelerating?

Over time, the Universe becomes less dominated by dark matter and more dominated by dark energy. Is one transforming into the other?

13.8 billion years ago, the hot Big Bang gave rise to the Universe we know. Here's why the reverse, a Big Crunch, isn't how it will end.

Popular media often frame scientists as having a cold, sterile view of the world. That couldn’t be further from the truth.

Look out at a distant object, and you're not seeing it as it is today. It's size, brightness, and actual distance are all different.

The laws of physics state that you can't create or destroy matter without also creating or destroying an equal amount of antimatter. So how are we here?

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.

With 1550 distinct type Ia supernovae measured across ~10 billion years of cosmic time, the Pantheon+ data set reveals our Universe.

Yes, the Universe is expanding, but you might wonder, "How fast is it expanding?"

The Universe is supposed to be the same everywhere and in all directions. So what's that giant "cold spot" doing out there?

Just 12 million light-years away, the galaxies Messier 81 and 82 offer a nearby preview of the Milky Way-Andromeda merger.

Is the Universe finite or infinite? Does it go on forever or loop back on itself? Here's what would happen if you traveled forever.

There are an estimated two trillion galaxies within the observable Universe. Most are already unreachable, and the situation only gets worse.

It is time to give the Russian cosmologist the credit he deserves.

We frequently say it's 2.725 K: from the light left over all the way from the Big Bang. But that's not all that's in the Universe.

There are two fundamentally different ways of measuring the Universe's expansion. They disagree. "Early dark energy" might save us.

From before the Big Bang to the present day, the Universe goes through many eras. Dark energy heralds the final one.

Known as primordial black holes, they could thoroughly change our Universe's history. But the evidence is strongly against them.

A wild, compelling idea without a direct, practical test, the Multiverse is highly controversial. But its supporting pillars sure are stable.

Developing an awareness of and an appreciation for science is what we all truly need, not what we've been doing.

We know it couldn't have began from a singularity. So how small could it have been at the absolute minimum?

After more than two decades of precision measurements, we've now reached the "gold standard" for how the pieces don't fit.

The same (former) NASA engineer who previously claimed to violate Newton's laws is now claiming to have made a warp bubble. He didn't.

There's a big difference between the notions of 'false vacuum' and 'true vacuum' states. Here's why we don't want to live in the former.

Without these two elements, we’re doomed to fail. In this day and age, it’s virtually impossible to have sufficient expertise to figure out what the complete, comprehensive, scientifically validated truth surrounding […]

Whatever’s lurking out there, it isn’t all, or even mostly, normal matter. When it comes to the Universe, it’s only natural to wonder what, exactly, it is that makes everything up. […]

If it wasn’t a singularity, how small could it have been? Today, when you look out in any direction as far as the laws of physics allow us to see, the […]