We have two ways of measuring the expansion rate. Here’s the harder one. If you want to understand where our Universe came from and where it’s going, you need to measure […]

The newest record-setting quasar houses an enormous black hole. No one knows how. In every scientific field, we’re always on the lookout for whatever new discovery might reveal what’s currently beyond […]

Binary pulsars are doing what no other measurement has done: measure our galactic acceleration directly. Even though the majority of the matter that makes up our Universe may be completely […]

If you thought it was just one rich region in space, look deeper and wider. Shining brilliantly in January’s skies is the Great Orion Nebula. By 10 PM every night in […]

And can we devise an experiment to tell, even when we aren’t looking? One of the most bizarre aspects of quantum physics is that the fundamental entities that make up the […]

The expansion rate is dropping, but distant galaxies are accelerating. Here’s how. If you take a look at any galaxy in the Universe that isn’t gravitationally bound to our own, we’ve […]

For the cosmos, it’s all too easy being green. Stars come in a wide variety of colors, but never green. Stars form in a wide variety of sizes, colors and masses, […]

The smallest and faintest stars of all, even the failed stars that didn’t make it, are hiding some fascinating secrets. You might have thought that if we were going to […]

It’s 92 billion light-years wide after just 13.8 billion years. And that’s just fine. If there’s one rule that people know about how fast things can move, it’s that there’s a […]

No matter how your year went, Hubble’s views of the Universe never disappoint. Year after year, Hubble’s telescopic views are unparalleled. Saturn, its rings, and 5 of its moons are […]

Two stellar mass black holes, if they merge in the vicinity of a supermassive black hole, could have their gravitational wave signal affected by the strongly curved space around them. […]

After a wait of 397 years in orbit, we’re finally getting a truly ‘Great’ Conjunction. Recently, December 21, 2020, Jupiter and Saturn finally met. Looking towards the southwest skies from […]

It doesn’t propagate at infinite speeds, and that’s a problem for Newton. When you look at the Sun, the light you’re seeing isn’t the light that’s being emitted right now. Instead, […]

With just a few more neutron star mergers, we’ll have the best constraints of all-time. How fast is the Universe expanding? Ever since the expanding Universe was first discovered nearly […]

And what can it teach us about our Solar System’s earliest days? In many ways, astronomy is unique among the sciences. In every other field, you have the ability to design […]

Learn how to get the best views no matter where you are. Every year, no matter what else is occurring on Earth or in the heavens, you can rely on two […]

We’ve found our first ones! The question is: how did they survive? Over the past 2 years, an exciting development has finally arisen: scientists have measured a large number of small, […]

If we’re migrating slowly away, is our speed changing, too? Every year, planet Earth completes one revolution around the Sun while spinning on its axis. On a year-to-year basis, our […]

A cosmic puzzle is finally solved, as new observations answer the question of why this galaxy exists at all. For the last couple of years, astronomy has had a tremendous puzzle […]

Don’t wait until Christmas to gift a telescope this year. All throughout the year, two bright lights have stood out in the post-sunset skies. Earlier this year, on March 31, 2020, […]

How many potentially habitable planets are there? We sincerely don’t know. One of the most compelling scientific goals humanity has set for itself is to find extraterrestrial life: biological activity originating […]

There’s more light than we can account for, and we’ve just measured it robustly for the first time. When we look out at the darkest night skies available on Earth, even […]

They’re not just a theoretical prediction of quantum gravity. They should be detectable, too. The Universe, if you look at it closely and carefully enough, is fundamentally quantum in nature. […]

In our Universe, a left hand reflected in a mirror or pond appears to be a right hand. While most of the laws of nature are symmetric under reflections, obeying […]

We haven’t discovered life beyond our Solar System yet, but we’re closer than ever before. Over the past 30 years, we’ve gone from zero exoplanets to thousands. With each new […]

Entropy always increases, but that doesn’t mean it was zero to start with. One of the most inviolable laws in the Universe is the second law of thermodynamics: that in any […]

Once only dark energy remains, empty space still won’t be completely empty. Imagine, if you dare, the very end of the Universe. The stars — past, present, and future — have all burned out. […]

You might be inclined to modify gravity instead, but those ideas have grossly unequal evidence supporting them. What is it, exactly, that you’re supposed to do when the predictions of […]

Known as the ‘North Star,’ Polaris won’t stay that way forever. Planet Earth spins a full 360°, about its axis, every 24 hours. The Earth in orbit around the Sun, with […]

As long as it remains operational, we’ll have a chance to conduct groundbreaking science with it. In the history of spaceflight, only five spacecraft ever launched by humanity possess enough energy […]