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

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

Hubble's deepest views of space revealed fewer than 10% of the Universe's galaxies. James Webb will change that forever.

Shooting star or piece of space dust?

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.

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

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.

A few years ago, the first dark matter-free galaxies were announced, and then immediately disputed. Now, there are too many to ignore.

The majority of the matter in our Universe isn't made of any of the particles in the Standard Model. Could the axion save the day?

Although most of the Universe's mass is dark matter, which gravitates just as well as normal matter, it still can't make black holes.

But the upcoming James Webb Space Telescope compels us to add, “so far.” Beginning with its 1990 launch, NASA’s Hubble Space Telescope revolutionized our conception of the Universe. This photo of […]

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. […]

“Hubble’s Law” is only an approximation, and breaks down when we need it most. From anywhere in the Universe, you can choose to look out at any other galaxy that’s present. […]

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 […]

Both made monumental contributions that were far ahead of their time. It’s hard to believe, but the idea that the Universe was dominated not by normal matter but rather by dark […]

Hubble, our greatest space-based observatory today, is just the beginning. The Hubble Space Telescope has been astronomy’s most revolutionary observatory in history. The stars and galaxies we see today didn’t […]

When you mix science with speculation, you get speculation. But the underlying science is still real. Whenever you hear the phrase, “it’s just a theory,” it should trigger alarm bells in […]

Only the best physical theories outlast the minds that invented them. Throughout the 20th century, a number of discoveries revolutionized our Universe. The discovery of the interior structure of atoms as […]

All scientific theories, at some level, are wrong. That’s why consensus is so vital. There are two important and common words that, when used scientifically, have a very different meaning than […]

Despite all the challenges, Hubble has vindicated this discovery. Practically everywhere we look in the Universe, the large-scale objects that we see — small galaxies, large galaxies, groups and clusters of galaxies, […]

How slight differences could have forever changed our cosmic history. 13.8 billion years ago, what we know today as our Universe began with the hot Big Bang. Filled with matter, antimatter […]

Is the Universe the same everywhere? Or are there truly ‘special places’ around? For practically all of human history, one assumption about our place in the Universe had long gone unchallenged: […]

Filaments, hundreds of millions of light-years long, were just caught spinning. In our own cosmic backyard, everything we see spins, rotates, and revolves in some fashion or other. Our planet […]

With 5,000 square degrees of data, the Dark Energy Survey has something important to say. For as long as humans have been studying the Universe, we’ve yearned to know the answers […]

Our galaxy not only isn’t stationary, but different parts are accelerating at different rates. When we think about the Universe as a whole, the accelerations that objects experience from our […]

Or is ‘new space’ created in between the gaps of the ‘old’ space? It’s been almost 100 years since humanity first reached a revolutionary conclusion about our Universe: space itself doesn’t […]

The last image puts it all in perspective. Compared to what we find in our Solar System, galaxies are truly enormous. The Sun may be 109 times the diameter of […]