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Uranus and Neptune - Twin Planets
Uranus and Neptune are ice giants and twin planets. They are very similar in many ways, but they aren't identical twins. For example, Uranus orbits lying down and Neptune is much warmer than it should be.

Annie Jump Cannon
Oh! Be a fine girl (guy)--kiss me! This is the traditional mnemonic for the way stars are classified: OBAFGKM. Find out about the astronomer and suffragette who devised the system and who said that astronomical spectroscopy made it "almost as if the distant stars had acquired speech."

Astronomy Newsletter Sign-up
The free astronomy newsletter is easy to sign up for, offering a reminder of the latest articles, forum posts and news.

What Is Astrobiology
Do you wonder if there's life elsewhere in the universe? The universe is a big place, so it seems likely that there is. See how astrobiologists are helping to plan the search.

Pluto Is a Dwarf Planet
Some people are still upset that Pluto isn't considered a planet any more. But was it ever really a planet?

What Herschel Found in a Dark Cloud
What's hiding within an impenetrable dark cloud in the constellation of the Eagle? It's a stunning stellar nursery, and the Herschel Space Observatory was able to photograph it.

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