Anatomy of the Rings
Images sent back from Cassini are resolving age-old mysteries about Saturn's rings.
Anatomy of a Rover
Examine the robotic geologists and their scientific instruments.
Asteroid That Hit L.A., The
A catastrophe calculator lets you try out some "what if" scenarios.
Birth of a Black Hole
In this slide show, see how a dying star is reborn as a black hole.
Birth of a Supernova
What exactly happens in a supernova explosion? See step-by-step the sequence of events that unfold during Type Ia and Type II supernovae.
Blueprint for a Space Station
With animations and digital drawings, learn about key components of the ISS, from the Canadian-built robotic arm to the Japanese Experiment Module with its "back porch."
Build a Rocket
Learn more about how the innovative German V-2 rocket worked by assembling it yourself.
Catalogue of the Cosmos
Examine some of the universe's weirdest entities.
Day In the Life, A
Learn what it's like to be an astronaut aboard the Mir.
Decoding Cosmic Spectra
Play astronomer and analyze the spectral fingerprints of a planet, star, galaxy, and nebula.
Design a Parachute
Create a parachute both strong and light enough to safely slow the rovers in their descent toward Mars.
Do Aliens Exist in the Milky Way?
In this interactive poll, explore a series of arguments for and against, then vote online.
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Drake Equation, The
Try your hand at calculating how many intelligent, communicating civilizations might be in our galaxy.
Explore the Moon
Join the Apollo astronauts on the surface in this series of stunning 360-degree panoramas, one each from the six successful Apollo moon landings.
Force of Impact
How could a lightweight piece of debris cause catastrophic damage? Find out in this simulation of the shuttle's launch.
The force of gravity for astronauts orbiting Earth is just about the same as it is on our planet's surface. Why, then, do they float? Find out here.
Astronomer Andrea Ghez talks of her huge discovery and her life. Hear audio highlights or go to the full interview.
History of the Universe
Follow the evolution of the universe from the big bang to the time 10100 years from now when burned-out stars and black holes will have evaporated.
If you're standing on the moon and the Earth is directly overhead, how long will it take for our planet to reach the moon's horizon? Take a shot at this and other lunar brainteasers.
Follow animations that describe how the Doppler effect helps astronomers determine whether stars are moving toward or away from Earth and at what speed.
Origins Game, The
Where are scientists making the great discoveries in origins research? Check out our world map.
Pillars of Creation, The
Assemble the famous image of the Eagle Nebula from raw data beamed down from the Hubble Space Telescope.
See a Reversal
Watch a simulated flip of the Earth's magnetic field, from the first signs of instability to the final reversal
Signs of Life
Use data to locate the planet Jupiter and determine if a habitable planet exists anywhere nearby.
Sounds of Titan
Hear the first-ever audio recording from one billion miles away, and find out what makes sounds in space different from those on Earth.
Spin a Spiral Galaxy
Spin a spiral galaxy on two axes, revealing how a galaxy can appear to be elliptical or round or flat in shape, depending on your vantage point.
A surveillance-image specialist examines photos of Iraq, North Korea, and other political hotspots.
Take a Tour of Mir
Click through a layout of the entire space station, complete with walkthrough video of the interior of each module.
Think Like Einstein
The special theory of relativity isn't all that difficult to understand, if you follow Einstein's logic.
Send an astronaut on a round-trip journey to a star and then compare her age with a person who stayed on Earth.
Tour the Spectrum
Radio waves, microwaves, infrared waves, visible light, X-rays, and gamma rays are all part of the electromagnetic spectrum. Get a comprehensive view of all the rays and waves in this self-guided tour.