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Astrophysics
Even without the greatest individual scientist of all, every one of his great scientific advances would still have occurred. Eventually.
Our Solar System's outer reaches, and what's in them, was predicted long before the first Oort Cloud object was ever discovered.
In 2022, the probe will crash into an asteroid while a nearby satellite captures it on camera.
Previously, only the brightest and most active galaxies could pierce the obscuring wall of cosmic dust. At last, normal galaxies break through.
We should all pause to appreciate the awe-inspiring beauty of the Universe.
The stars, planets, and many moons are extremely round. Why don't they take other shapes?
From hellishly hot planets to water worlds, some distant planets are like nothing in our Solar System.
Finding out we're not alone in the Universe would fundamentally change everything. Here's how we could do it.
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?
There are a few possible solutions to the problem of interstellar travel, but they largely remain within the realm of science fiction.
Communication with home will be difficult on long-haul space flights. The longer this isolation goes on, the more detached a crew becomes.
The most unique interloper into our Solar System has a natural explanation that fits perfectly — no aliens required.
We once thought the Moon was completely airless, but it turns out it has an atmosphere, after all. Even wilder: It has a tail of its own.
We haven't seen a partial eclipse lasting this long since 1440, and won't again until 2669. North America is perfectly positioned for 2021's.
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.
The latest gravitational wave data from LIGO and Virgo finally shows us the truth: there are no "gaps" in the masses of black holes.
Based on the atoms that they're made out of, the innermost planet should always be the densest. Here's why Earth beats Mercury, hands down.
“Should they strike, each of them has an energy at impact equal to all of the nuclear weapons on Earth combined."
There are over 100 known elements in the periodic table. These 8 ways of making them account for every one.
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 […]
Once merely a theoretical curiosity, they might be the key to understanding so much more. Out of all of the known particles — both fundamental and composite — there are a whole slew of properties […]
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. […]
It happened more than once, and needed to. Here’s why. If there’s one thing you can be certain about when it comes to outer space, it’s that it’s transparent, not opaque, […]
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 […]
Galaxies can have regions both hotter and colder than the background radiation of the Universe. When we talk about the depths of space, we get this picture in our heads […]
We’ve already observed three cases where it’s happened. When you look at an object in space, it’s pretty easy to tell if it’s a star or a planet. Stars are […]
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 […]
It could evolve, strengthen, decay, or not be alone. Our known Universe contains matter, radiation, and dark energy. While matter (both normal and dark) and radiation become less dense as […]
The raw ingredients just weren’t there. Thankfully, their predecessors were. Here on Earth, our planet practically overflows with life. After more than 4 billion years, life has spread to practically […]