the best science on the web about
astronomy

Orion Nebula
Image: NASA

Orion Nebula

How did we ever find out anything about the lights in the night sky? How did we come to know what stars are made of, that they are born and die, that they're part of galaxies, all flying apart, faster and faster?

Beginning with a visit to a nursery of stars and planets, this page zooms in on astronomy.

Deep Sky Videos
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Classify Galaxies

Classify Galaxies

Help astronomers by classifying galaxies according to their shapes. You might be the first person ever to examine the galaxy you're looking at. More...

Activity
Galaxy Zoo
Looking Through Galactic Space Clouds

Looking Through Galactic Space Clouds

By studying all the wavelengths of light coming from outer space, including those our eyes cannot see, astronomers weave together a more complete picture of the universe. More...

Video
Institute of Physics
Mysterious Objects at the Edge of the Electromagnetic Spectrum

Mysterious Objects at the Edge of the Electromagnetic Spectrum

By looking into deep space with instruments that detect gamma rays, astronomers are discovering mysterious objects spewing out "unearthly" amounts of energy. More...

Video
NASA
Telescopes & Light

Telescopes & Light

Different kinds of telescopes give us different information about the universe by detecting light of different wavelengths. Compare the images from a variety of telescopes. More...

Interactive
Smithsonian Astrophysical Observatory
Astronomy Picture of the Day

Astronomy Picture of the Day

Every day, this site serves up an image of something astounding in outer space, along with an explanation from an astronomer. More...

Images
NASA/Goddard Space Flight Center
Career as an Astronomer: Cathy Imhoff

Career as an Astronomer: Cathy Imhoff

In this interview, an astronomer tells why she loves her job, and also why going into astronomy can be hard and even discouraging. More...

Profile
Scholastic
SETI@home

[email protected]

Want to help hunt for aliens? SETI researchers comb through signals from space, searching for evidence of ET. But to do that, they need a lot of computing power. That's where you come in. More...

Activity
University of California, Berkeley
100 Greatest Discoveries: Astronomy

100 Greatest Discoveries: Astronomy

Not only is the universe expanding, it's speeding up! Hear about this astonishing discovery from one of the astronomers who made it. More...

Video
Science Channel
Bad Astronomy

Bad Astronomy

Astronomer Phil Plait set out to clear up the misconceptions about astronomy he found in movies, on TV, all over the place. Click the links on the left of your screen and let Plait set you straight. More...

Article
Phil Plait
Cepheid Variables 1

Cepheid Variables 1

Henrietta Leavitt’s discovery about 100 years ago made it possible for astronomers to figure out the distances to other galaxies. More...

Video
Khan Academy
Infrared Astronomy

Infrared Astronomy

Want to see the farthest galaxies or stars behind clouds of dust? In that case you'll need a telescope that detects infrared wavelengths of light. More...

Video
Caltech
PlanetQuest: The Search for Another Earth

PlanetQuest: The Search for Another Earth

What's happening now in the search for exoplanets? What have we learned? What are the astronomers doing next? You'll find a ton of exoplanet info here.
More...

Article
NASA/JPL
Spectroscopy of Stars

Spectroscopy of Stars

How can astronomers know what the Sun or any other star is made of? In fact, it isn't hard to find out. More...

Video
BBC
Tests of the Big Bang: The CMB

Tests of the Big Bang: The CMB

First, scientists predicted that space must be full of radiation left over from the Big Bang. Then they found it! Studying this radiation can tell us about the beginning of everything. More...

Article
NASA
The Hubble Deep Field Academy

The Hubble Deep Field Academy

After the Hubble telescope captures images of the most distant regions in the universe, someone must make sense of them. See if you can. Then, find out how astronomers do it. More...

Interactive
Space Telescope Science Institute
What Is Radio Astronomy?

What Is Radio Astronomy?

Radio waves from space have revealed wonders that we would never have discovered had we relied only on our eyes. More...

Article
National Radio Astronomy Observatory

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