Astronomy
Astronomy is a broad discipline covering all facets of astrophysics. In this section you can learn about the origins of the universe, black holes and other astronomical phenomena.
Constellation Pictures
How to Find Orion's Belt in the Night Sky
Radio Telescope Image Gallery
How do I build a telescope at home?
Shooting the Stars as an Astrophotographer
What's the Brightest Star in the Sky? Depends on the Season
The Largest Star in the Universe Is 1,700x Bigger Than Our Sun
Twinkle, Twinkle: The Ultimate Stars Quiz
What Is a Harvest Moon?
The Mysteries of Mercury Retrograde Unveiled: A Cosmic Phenomenon
A Comprehensive Guide to the Layers of the Earth
Learn More / Page 4
You might call it a Christmas miracle. Jupiter and Saturn will align so closely they may look like a double planet. The last time we saw this was in 1226.
The Quadrantids are a short but powerful meteor shower that shows up in early January. How can you glimpse it?
A magnetar is a neutron star with a super-strong magnetic field. Astronomers consider them among the scariest objects in the universe, but why?
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Arcturus is 113 times brighter than our sun, even though it's only a little bigger. What else should we know about this red giant?
Surely you've watched tons of sunsets in your lifetime. But have you ever seen the sunset and the moonrise simultaneously? Is that even possible?
Blood moons always bring out the stargazers though they aren't that rare. So what makes blood moons red? And do they differ from lunar eclipses?
When December's moongazing rolls around, you'll want to take a look at the cold moon, an appropriate moniker if there ever was one.
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This doughnut-shaped ring around the sun is home to millions of comets, moons, dwarf planets and other celestial objects. What are these objects doing in the Kuiper belt?
Head's up, stargazers! Mark your calendars for the 22 must-see events this year.
News headlines talk about a rare green comet appearing in the sky. The comet itself is rare, but green comets, not so much. What makes some comets appear green?
February is a cold time of year, and the snow moon nickname pays homage to that. What are some other names for February's full moon and what do they mean? Plus, when can you see the snow moon?
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April's pink moon isn't called pink because our beloved bright white moon suddenly takes on a rosy hue. So, why is it called the "pink moon"?
Native American tribes have called the May moon the flower moon for centuries. The name even inspired a best-selling novel and film.
The full moon in June is known as the strawberry moon. It's a sweet name, but how did the strawberry moon get its moniker, and what else is it called?
There are eight phases in the lunar cycle and the moon is in one of them every night. What are these phases of the moon?
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The solar system's largest planet will pass closest to Earth at the same time it's at opposition. That means it will be the biggest and brightest it's been in the sky in decades.
In 2022, the full moon, called the hunter's moon, will occur Oct. 9. Why is it called that and when can you see it?
Astronomers at HaleakalÄ Observatory in Hawaii noted a bright X-ray emission in 2018, which persisted for three weeks and glowed ten times more brightly than previously studied supernovas, but are just now beginning to understand it.
Not sure what you're seeing in the night sky? Astronomy software such as Stellarium makes stargazing easier by helping to explain what you're seeing when you look at the stars.
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Many people dream of climbing Mount Everest, but what if you could scale the highest mountain in the solar system? That one is more than twice as tall as Everest! So, where is it?
If you imagine the eight major planets in a single line stretching out from the sun, this alignment occurs roughly every 13.4 trillion years. And our solar system is 4.5 billion years old.
Aldebaran is not just the brightest star in the constellation Taurus, it's also the 14th brightest star in the sky.
The Tau Herculids meteor shower was made of debris from the broken comet SW3 and produced a lot of shooting stars, but not quite the meteor shower that was hoped for.
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It's tough to wrap your mind around a time when the Earth wasn't here. So how do Earth and the rest of the planets out there get their start in the universe?
By Robert Lamb
We can't defy the odds of an asteroid taking a turn for Earth forever, so the world's astronomers watch the sky. What happens once they spot something?
By Robert Lamb