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.
Topics to Explore:
Early dark energy, a form of dark energy that may have existed a few hundred thousand years after the big bang, could help clarify the universe's rate of expansion. But its existence hasn't been proven.
The Mars solar conjunction occurs every two years and forces NASA to stop communicating with assets on the Red Planet. So what's the deal?
Scientists have observed flashes of X-rays coming from behind a supermassive black hole, consistent with Albert Einstein's prediction that extremely large objects can bend light.
You know Saturn and Venus and Mars and ... some others. Can you put the eight planets of the solar system in the correct order? There are several ways to do this.
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?
Whether it's a solar eclipse, a meteor shower or the launch of the long-awaited James Webb Space Telescope, 2021 has a lot to offer.
The Quadrantids are a short but powerful meteor shower that shows up in early January. How can you glimpse it?
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.
Every autumn, Earth passes through a stream of debris left by Halley's comet, resulting in nighttime meteor showers in mid-October. The best time this year is Oct. 20-21.
Star-gazers gasped when they saw how much Betelgeuse dimmed in 2019 and the reason wasn't clear. Even though it's back up to full strength, how long will it be before it explodes? We haven't seen a supernova in over 400 years.
It's a celestial gift in the middle of August. Just look up for a spectacular sight.
Comet NEOWISE comes by only once every 6,800 years. But it will be visible to anyone with binoculars or even to the naked eye. Here's how to spot this rare event.
Watching meteor showers can be a spectacular sight. We talked to some astronomy experts on how to improve your meteor-viewing experience.
Astronomers used Hubble's full range of imaging to dissect wild 'fireworks' happening in two nearby young planetary nebulas.
In 1953, CalTech geochemist Clair Patterson came up with an estimate for Earth's age that still holds today.