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What's the Big Idea About Astronomy?

Photos: Spiral galaxy (M100, A Grand Design): courtesy of APOD and NASA; Astronomy: courtesy of the Hubble Heritage Team (STScI/AURA); Dr. Raghvendra Sahai (JPL); Dr. Arsen R. Hajian (USNO) and NASA; Our Solar System: courtesy of Bill Arnett, Nine Planets; Newborn stars in the Orion Nebula: courtesy of N.A. Sharp (REU Program) /AURA/NOAO/NSF; Sun: courtesy of EIT Consortium/NSSDC and NASA, SOHO; A large cluster of stars: courtesy of AURA/ESA/Goddard Space Flight Center, STScI and NASA, Hubble Space Telecope; Hubble Space Telescope: courtesy of STScI/AURA and NASA; Hubble Telescope view of deep space: courtesy of R. Williams, the HDF team (STScI) and NASA; 13,000,000,000 years old: courtesy of Chris Van Dunsen, AMNH and the National Center for Supercomputing Applications, 1999; Eagle Nubula (a star nursery): courtesy of J. Hester and P. Scowen (Az. State University) and NASA; Colliding Galaxies: courtesy of B. Whitmore (STScI, F. Schweizer (DTM) and NASA; Illustrations: Daryl Collins

Astronomy is a BIG subject. We've brought learning about it down to size with this look at the big ideas you need to know.

Why Can't I See More Stars?

Photos: Neil at 12 with Dad: courtesy of Neil de Grasse Tyson; Neil today: courtesy of Denis Finnin, AMNH; Illustrations: Jim Paillot

Tips for beginning stargazers.

Cosmic Wallpapers

Photos: © AMNH

Decorate your desktop with these starry images!

What do you know about Stars?

Test your starry knowledge in this stellar quiz!

In Pictures: Journey to the Stars

In the Milky Way Galaxy alone, there are hundreds of billions of stars. But that hasn't always been the case...

What Do You Know About The Universe?

Test your knowledge about the things we can't see.

Bio Poll

Photos: American toad, Asian multicolored ladybeetle, blood star, blue poison frog, blue-ring top snail, boojum tree, formosan subterranean termite, french angelfish, greater bird of paradise, green acouchi, hygroscopic earthstar, long-tailed salamander, jelly bellies, Mexican redknee tarantula, owl butterfly, radiated tortoise, red spotted newt, rosy periwinkle, sally lightfoot crab, ten spot skimmer dragonfly, the sickener, tusked chameleon, varroa mite, whitespotted boxfish, white's treefrog, witch's butter, yellow fever mosquito: refer to Tree of Life Organism Pages imagery credits; aye-aye: courtesy of Connie Bransilver, Duke University Primate Center buffalo trunkfish (fishes swim): courtesy of John White, California Academy of Sciences; butterfly, city, desert, forest, garbarge, hummingbird, ocean, pigeon, plants, squirrel, volunteer your time, white-tailed spider: AMNH; Carolina parakeet, horned lizard: courtesy of AMNH Department of Library Services; coral: courtesy of Discovery Channel Online; giant squid: AMNH, Hall of Biodiversity; ladybug: courtesy of Albert P. Bekker, California Academy of Sciences; passenger pigeon: AMNH; halls praying mantis: courtesy of Gladys Lucille Smith, California Academy of Sciences; Illustrations: Dzanga-Sangha: Laura Friedman; great auk: courtesy of AMNH Department of Library Services, #6266, extinct 1844. By Charles Hamilton Smith, from Charles Hamilton Smith,Original Drawings, 1795-1859. 23 vols; laughing owl: courtesy of AMNH Department of Library Services, #6253, extinct New Zealand, c. 1914. By John G. Keulemans, from G. D. Rowley, Ornithological miscellany, vol. 1. London: 1875.; O'ahu 'O'o: courtesy of AMNH Department of Library Services, #6286, By John G. Keulemans, from Lionel Walter Rothschild, The avifauna of Laysan and the neighbouring islands, London, 1893-1900; recycle: Eric Hamilton seaweed, soybeans, olive branch, cinnamon: Patricia Wynne

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Illustrations: Eric Hamilton

Did you know that biodiversity provides us with things that we need?

Biodiversity Books

Explore biodiversity with these 12 books.

Chasing Spiders Down Under

Photos: Introductory page: rosy periwinkle: courtesy of James A. Manhart shell: courtesy of Steve Thurston, AMNH; Creatures of the Reefs: photos of Paula Mikkelsen and Dan Brumbaugh: courtesy of Discovery Channel Online shell photos: courtesy of Steve Thurston, AMNH; Magnificent Madagascar: Chris Raxworthy (top): AMNH Chris Raxworthy (middle): courtesy of Chris Raxworthy Mimic-ants: courtesy of Discovery Channel Online; Chasing Spiders Down Under: photos of Valdimir Ovtsharenko: courtesy of Discovery Channel Online; Illustrations: Creatures of the Reefs: Steve Thurston; Magnificent Madagascar, Chasing Spiders Down Under: Barrett Klein

See how an arachnologist studies these eight-legged creatures in Austrailia.

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