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The Arthur Ross Terrace will be closed this morning, Tuesday, October 21, for a private cultural observance. You many observe smoke and/or fire coming from the Terrace at that time. The FDNY has been notified in advance, and all safety precautions are in place. The Terrace will reopen at 1 pm.

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Hall of Fame

Jupiter has more than 60 moons.

Some meteorites are as old as the solar system.

The biggest meteorite ever found weighs around 60 tons,
while some meteorites are the size of a grain of sand.

Some meteorites are small pieces of the moon. 

"Shooting stars" are actually meteors.

A Closer Look at Mars

Photos: A Closer Look at Mars: Planets and Sun: Daryl Collins; Robot: Jim Paillot; How Do We Know So Much about Mars: Telescopes: courtesy of David Crisp and the WFPC2 Science Team (JPL/CalTech); NSSDC, and NASA Spacecraft: NASA, Viking Project Robots: IMP Team, JPL (Sojourner (tm); Mars Rover (tm) and spacecraft design and images copyright: 1996-97, California Institute of Technology. All rights reserved. Further reproduction prohibited.) and NASA; Illustrations: A Closer Look at Mars: Jim Paillot; The Search for Martian Life: Maria Zuber: courtesy of Maria Zuber; Star Background: courtesy of AURA; One-on-One with the Sun: Venus, Earth, Mars: courtesy of NASA Sunspot: courtesy of AURA/NOAO/NSF; Crab Nebula: courtesy of Bill Shoening, AURA/NOAO/NSF; Boy: courtesy of Denis Finnin, AMNH

Find out what we know about Mars in this online tour of Earth's closest neighbor.

An Interview with Mars

Illustrations: Jim Steck

Help reporter Stella Stardust interview the planet Mars

Are YOU cut out for Mars?

Do you have what it takes to go on a space mission to Mars?

In Pictures: Beyond Earth Astro Poll

Photos: The first Moon Walk, Buzz Aldrin: courtesy of NASA, taken by Neil A. Armstrong, Apollo 11; Earth forming: courtesy of JSC and NASA, Apollo 17; The Sun forming: courtesy of EIT Consortium/NSSDC and NASA, SOHO's EIT EIT Asteroids flying, Ida and it's moon Dactyl: courtesy of NSSDC and NASA; Galileo Sun's nuclear energy: courtesy of EIT Consortium/NSSDC and NASA, SOHO's EIT; Colliding galaxies: courtesy of The Hubble Heritage Team/STScI/AURA and NASA, Hubble Space Telescope Center, Debra Meloy Elmegreen, Bruce C. Elmegreen, Michele Kaufman, Elias Brinks, Curt Struck, Magnus Thomasson, Maria Sundin, and Mario Klaric; Black Holes: Accretion Disk Binary System: STScI and NASA; The Center of Centaurus, E.J. Schreier (STScI) et al., NASA The birth of a star: courtesy of The Hubble Heritage Team and NASA, Hubble Space Telescope Center, principal astronomers: John MacKenty, Jesus Maiz-Apellaniz, Colin Norman, Nolan Walborn, Richard Burg, Richard Griffiths and Rosemary Wyse; A volcano erupting on Io: courtesy of JPL, California Institute of Technology/NSSDC and NASA, Galileo; A solar flare: courtesy of JSC and NASA; An Earthrise: courtesy of NSSDC and NASA, Apollo 8; Universe expanding: courtesy of Robert Williams and the Hubble Deep Field Team (STScI) and NASA; Life exists: courtesy of JPL and NASA, Mars Global Surveyor; Galaxies exist: courtesy of Hubble Heritage Team (AURA/STScI/NASA); Milky Way: courtesy of Photo Researchers; Orion: courtesy of "Observers", "Institute", Sven Kohle and Till Credner; Big Dipper: AMNH; An Asteroid, Gaspra: courtesy of JPL, California Institute of Technology/NSSDC, U.S. Geological Survey, Cornell University and NASA, Galileo; Satellite: courtesy of JSC and NASA, American Satellite Company; communications satellite Moon Rock: courtesy of NSSDC and NASA, Apollo 17; Meteor (Williamite Meteorite): courtesy of AMNH Department of Library Services, 3316; Moon formed: courtesy of JSC and NASA, Apollo 11; Saturn's rings: courtesy of JPL, California Institute of Technology and NASA, Voyager 2; Venusian volcanoes: courtesy of JPL, California Institute of Technology/NSSDC, U.S. Geological Survey and NASA, Magellan; Water under Mars: courtesy of JPL, Malin Space Systems and NASA, Mars Global Surveyor; Neptune's Great Dark Spot: courtesy of JPL, California Institute of Technology/NSSDC and NASA, Voyager 2; Jupiter's Moons: courtesy of JPL, California Institute of Technology and NASA, Voyager 2; Pluto's surface: courtesy of Dr. R. Albrecht, ESA/ESO Space Telescope European Coordinating Facility, NSSDC and NASA; Asteroid belt, Gaspra: courtesy of JPL, California Institute of Technology/NSSDC, U.S. Geological Survey, Cornell University and NASA, Galileo; Jupiter's Great Red Spot: courtesy of JPL, California Institute of Technology/NSSDC and NASA, Voyager 1; Halley's Comet: courtesy of NSSDC and NASA, ESA mission Giotto; Andromeda Galaxy: courtesy of Jason Ware, APOD; Surface of Moon: courtesy of NASA; Sunspots: courtesy of AURA/NOAO/NSF; Supernova 1987A: courtesy of ESA/STScI, Dr. Christopher Burrows and NASA, Hubble Space Telescope

Make your opinion count!

Astronomy Books

Eleven great ways to learn about everything under the Sun ... moon, and stars

Build the Big Dipper

To see what the Big Dipper would look like from outer space, build a mobile!

Cosmic Connections

Photos: Choice A: courtesy of JPL/Caltech and NASA; Choice B: courtesy of R. Williams, the HDF Team (STScI); and NASA; Choice C: courtesy of B. Whitmore (STScI); F. Schweizer (DTM); and NASA; Choice D: courtesy of L. Ferrarese (Johns Hopkins University) and NASA; Choice E: courtesy of HST, WFPC 2, Jeff Hester and NASA; Choice F: courtesy of Bruce Balick (U. Washington); Vincent Icke (Leiden U. of the Netherlands); Choice G: courtesy of NASA, Voyager 2; Choice H: AURA/NOAO/NSF

Match these awesome images from the Hubble Space Telescope with their descriptions.

Create Your Own Timeline

Photos: The Big Bang: Gas: courtesy of Neil de Grasse Tyson; Neil today: courtesy of Denis Finnin, AMNH; Illustrations: Create your own Timeline: Daryl Collins

Plot major cosmic events on a thirteen-billion-year timeline.

Don't Be Lost in Space

Illustrations: Earth, Solar System, Virgo Supercluster: David Hardy; Milky Way: Dennis Davidson; Universe: American Museum of Natural History and the National Center for Supercomputing Applications, 1999

Your address in space is a whole lot longer than your mailing address here on Earth.

Meet the Universe's Main Attraction... Gravity

Photos: Girl: courtesy of Denis Finnin, AMNH; Baseball: courtesy of Denis Finnin, AMNH; Illustrations: Newton: Amanda Duffy; Foot: Jim Paillot; Juggler: Chris Van Dunsen; Mars: Daryl Collins

Find out why a ball thrown in the air will return to the ground. 

How Did the Universe Begin?

Photos: The Big Bang: Gas: courtesy of Neil de Grasse Tyson; Neil today: courtesy of Denis Finnin, AMNH; Illustrations: Create your own Timeline: Daryl Collins

How Much is a Billion?

Photos: Milky Way Galaxy Milky Way as seen from Earth: courtesy of Photo Researchers; Q&A with Astronomer Julianne Dalcanton:Julianne Dalcanton: courtesy of Julianne Dalcanton; Spiral galaxy: courtesy of AURA/NOAO/NSF; Elliptical galaxy: courtesy of STScI; Irregular Galaxy: courtesy of Bill Shoening/AURA/NOAO/NSF; Sombrero Galaxy: courtesy of Bill Keel; Illustrations: How Much is a Billion: Jim Steck Q&A with Astronomer Julianne Dalcanton Amanda Duffy

How much space do you need to fit a billion oranges?

How to Write a Billion

Photos: Milky Way Galaxy: Milky Way as seen from Earth: courtesy of Photo Researchers; Julianne Dalcanton: courtesy of Julianne Dalcanton; Spiral galaxy: courtesy of AURA/NOAO/NSF; Elliptical galaxy: courtesy of STScI; Irregular Galaxy: courtesy of Bill Shoening/AURA/NOAO/NSF; Sombrero Galaxy: courtesy of Bill Keel; Illustrations: How Much is a Billion: Jim Steck; Q&A with Astronomer Julianne Dalcanton; Amanda Duffy

Learn scientific notation and get rid of all those zeroes.

Make Your Own Astronomy Stationery

Illustrations: Jim Steck, Jim Paillot, Daryl Collins

Send a note to a friend with these astronomical letterheads.

Meet the OLogist: Neil de Grasse Tyson

Photos: Neil de Grass Tyson Pages: Neil de Grasse Tyson: courtesy of Neil de Grasse Tyson; Astronaut on the moon: courtesy of John W. Young, Apollo 16 Crew, and NASA; Light divided by a prism: courtesy of Concept Images, 1998 Noriko all rights reserved; Hubble Telescope View from Deep Space: courtesy of R. Williams and the HDF Team (STScI) and NASA, Hubble Deep Field; Spectrum of light: courtesy of AURA/NOAO/NSF "Copyright Association of Universities for Research in Astronomy Inc. (AURA); all rights reserved." Infrared Hudson river view: courtesy of NASA; Radio telescopes: courtesy of Dave Finley, AUI, NRAO, NSF; The Moon: courtesy of NASA, Galileo; Saturn's Rings: courtesy of JPL, California Institute of Technology and NASA, Voyager 2; Milky Way as seen from the Earth: courtesy of Jayanne English (STScI) et. Al., CGPS, RAL/U. Calgary, APOD; Surface of Io: courtesy of University of Arizona, JPL/SSI and NASA, Galileo; Stars: courtesy of STScI, The Hubble Heritage Team and NASA; Planets: courtesy of NASA; Projector and Hayden Planetarium: courtesy of AMNH Department of Library Services; Kids: All people pictures: courtesy of subjects; Jupiter: courtesy of PDS/JPL and NASA, Voyager 1; Illustrations: All drawings: courtesy of subjects

Discover where starry-eyed Neil has followed his curiosity.

Moon Flip Book

Photos: Moon Watch Flip Book-Moon: courtesy of NASA; Illustrations: Quinten Steenhuis

See the moon in action! And discover why our view of it changes nightly.

More or Less Than a Billion

Photos: Milky Way Galaxy: Milky Way as seen from Earth: courtesy of Photo Researchers; Julianne Dalcanton: courtesy of Julianne Dalcanton; Spiral galaxy: courtesy of AURA/NOAO/NSF; Elliptical galaxy: courtesy of STScI; Irregular Galaxy: courtesy of Bill Shoening/AURA/NOAO/NSF; Sombrero Galaxy: courtesy of Bill Keel; Illustrations: How Much is a Billion: Jim Steck; Q&A with Astronomer Julianne Dalcanton: Amanda Duffy

What's a billion? Test your powers of estimation.

One-on-One with the Sun

Photos: Venus: courtesy of Bill Shoening, AURA/NOAO/NSF; Galaxy in montage: courtesy of STScI; Planets in montage: courtesy of NASA, Voyager 2; Kids: courtesy of Denis Finnin, AMNH; Illustrations: Stella Stardust: Jim Steck; Milky Way Galaxy: Denis Davidson

Find out what makes the Sun glow, and other amazing facts, in an up-close and personal interview with the Sun.

Q&A with Astronomer Julianne Dalcanton

Photos: Milky Way Galaxy Milky Way as seen from Earth: courtesy of Photo Researchers; Q&A with Astronomer Julianne Dalcanton:Julianne Dalcanton: courtesy of Julianne Dalcanton; Spiral galaxy: courtesy of AURA/NOAO/NSF; Elliptical galaxy: courtesy of STScI; Irregular Galaxy: courtesy of Bill Shoening/AURA/NOAO/NSF; Sombrero Galaxy: courtesy of Bill Keel; Illustrations: How Much is a Billion: Jim Steck Q&A with Astronomer Julianne Dalcanton Amanda Duffy

Find out what's fun about being astronomer and what's unique about our Milky Way Galaxy.

Solar System Scavenger Hunt

Illustrations: Eric Hamilton

Size up the planets with a model scavenger hunt.

Space Travel Guide

Illustrations: Eric Hamilton

Let your imagination run wild, and write an inspiring work of science fiction.

Stargazing

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

How many constellations and planets can you find among the thousands of stars in the night sky? Record your sightings in a stellar sky journal.

The Big Bang

Photos: The Big Bang: Gas: courtesy of Neil de Grasse Tyson; Neil today: courtesy of Denis Finnin, AMNH; Illustrations: Create your own Timeline: Daryl Collins

What we know, and don't know, about what started it all.

The Journey Begins

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

Almost all of the atoms in your body were once inside stars that exploded billions of years ago. Learn more mind-boggling facts from an astronomer.

The Milky Way Galaxy

Photos: Milky Way Galaxy Milky Way as seen from Earth: courtesy of Photo Researchers; Q&A with Astronomer Julianne Dalcanton:Julianne Dalcanton: courtesy of Julianne Dalcanton; Spiral galaxy: courtesy of AURA/NOAO/NSF; Elliptical galaxy: courtesy of STScI; Irregular Galaxy: courtesy of Bill Shoening/AURA/NOAO/NSF; Sombrero Galaxy: courtesy of Bill Keel; Illustrations: How Much is a Billion: Jim Steck Q&A with Astronomer Julianne Dalcanton Amanda Duffy

Tour this spinning pinwheel in space that we call home.

The Search for Martian Life

Photos: A Closer Look at Mars: Planets and Sun: Daryl Collins; Robot: Jim Paillot; How Do We Know So Much about Mars: Telescopes: courtesy of David Crisp and the WFPC2 Science Team (JPL/CalTech); NSSDC, and NASA Spacecraft: NASA, Viking Project Robots: IMP Team, JPL (Sojourner (tm); Mars Rover (tm) and spacecraft design and images copyright: 1996-97, California Institute of Technology. All rights reserved. Further reproduction prohibited.) and NASA; Illustrations: Jim Paillot; The Search for Martian Life: Maria Zuber: courtesy of Maria Zuber; Star Background: courtesy of AURA One-on-One with the Sun: Venus, Earth, Mars: courtesy of NASA Sunspot: courtesy of AURA/NOAO/NSF; Crab Nebula: courtesy of Bill Shoening, AURA/NOAO/NSF; Boy: courtesy of Denis Finnin, AMNH

Is there life on Mars? Find out what a NASA scientist thinks.

What Do You Know about Astronomy?

Photos: Q3a: courtesy of MOC Team and NASA, Mars Global Surveyor; Q2, 3b, 3c, 5, 7: courtesy of NASA; Q4: courtesy of Robert Williams and the Hubble Deep Field Team (STScI) and NASA; Q6: courtesy of Photo Researchers; Q8: courtesy of NASA/JPL/CALTECH; Q10: courtesy of ESA/STScI, Dr. Christopher Burrows and NASA, Hubble Space Telescope

How much do you really know about our place in space? Take this quiz to find out!

What Does Gravity Do?

Illustrations: Jim Paillot

A quick explanation of why we care about gravity.

What kind of life are we looking for on Mars?

Illustrations: Jim Steck

A fun test of what you know about the search for life on the red planet.

What would happen if the force of gravity were turned off?

Photos: Girl: courtesy of Denis Finnin, AMNH; Baseball: courtesy of Denis Finnin, AMNH; Illustrations: Newton: Amanda Duffy; Foot: Jim Paillot; Juggler: Chris Van Dunsen; Mars: Daryl Collins

A thought experiment that asks you to imagine a world without gravity's influence.

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...

Light the Way

Photos: Michael Shara: courtesy of Denis Finnin, AMNH; Illustrations: Equation Invasion: Tony Persiani; Everyday Einstein: Daryll Collins; Light the Way: Space cop: Daniel Guidera; Electromagnetic Spectrum: Eric Hamilton

Take a quick look at the fastest thing in the Universe.

Space and Time

Kid photos: courtesy of Denis Finnin, AMNH; It's All Relative: Jim Paillot; Rabbit, elephant, and ant: Francesco Santalacia; You Light Up My Life!: Cathy Sanchez Duvivier

How do you describe your place in the 4th dimension?

Everyday Einstein: Black Holes

Kid photos: courtesy of Denis Finnin, AMNH; It's All Relative: Jim Paillot Rabbit, elephant, and ant: Francesco Santalacia; You Light Up My Life!: Cathy Sanchez Duvivier

A quick explanation of the bottomless dimples in space we call black holes.

Planetary Mysteries

Photos: solar nebula: J. Bally (U. Colorado); H. Throop (SwRI); C.R. O¹Dell (Vanderbilt U.); NASA; Mercury exterior: NASA/JPL; Venus: NASA/JPL; Moon: Galileo Project, NASA; craters on Venus: NASA/JPL; owl and flower: courtesy of AMNH; coral reef: courtesy of Ian Skipworth, http://www.ianskipworth.com; bacteria: NASA; underwater scene: courtesy of AMNH; Earth's atmosphere: STS-91 Crew, NASA; Mars (all photos): NASA/JPL; Jupiter (all photos): NASA/JPL; Saturn (all photos): NASA/JPL; Uranus sideway tilt: Hubble Space Telescope; Uranus (all other photos): NASA/JPL; Neptune and Triton (all photos): NASA/JPL; Pluto (all photos): NASA/JPL; Illustrations: planets: James Hastings-Trew, http://gw.marketingden.com/planets/planets.html Mercury, Earth, and Jupiter cutaway: Calvin J. Hamilton, http://www.solarviews.com; solar system formation: E. Churchwell (University of Wisconsin); JPL, Caltech, NASA; planets comparison: NASA/JPL Messenger spacecraft: NASA; Magellan spacecraft: NASA/JPL; Jason-1 spacecraft and climate model: NASA/JPL; Odyssey spacecraft: NASA/JPL; Galileo spacecraft: NASA/JPL; Cassini-Huygens spacecraft: NASA/JPL; diagrams of Uranus and Earth tilt: Calvin J. Hamilton, http://www.solarviews.com; Voyager 2 spacecraft: NASA/JPL New Horizons spacecraft: NASA/JPL

Take a virtual tour of our solar system to explore its many mysteries.

Space Jell-O

Photos: courtesy of AMNH

Thanks to Einstein, we know that space bends around anything that has mass. Mix up some Jell-O, and bend your mind around this concept.

If Rocks Could Talk

Photos: Rondi Davies and all rocks: courtesy of AMNH, Roderick Mickens

Meet six rocks that travelled to the Museum from places like Mexico, Scotland, and even outer space.

What Do You Know About The Universe?

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

American Museum of Natural History

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