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:
Aldebaran is not just the brightest star in the constellation Taurus, it's also the 14th brightest star in the sky.
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.
Many people dream of climbing Mount Everest, but what if it were possible to scale the highest mountain in the solar system? That mountain is more than twice as tall as Everest! So, where is 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.
The gegenschein, "faint light" in German, occurs under very specific astronomical conditions when the sun reaches the exact opposite of Earth from wherever you're stargazing.
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.