All Planet Sizes

This illustration from the Lunar and Planetary Laboratory shows the approximate sizes of the planets relative to each other. Note that the planets are not shown at appropriate distances from the Sun.

Characteristics of the Sun

This video segment adapted from NASA describes the basic characteristics of our star, the Sun.

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Eve: Extreme Ultraviolet Variability Experiment

In this NASA video, scientists describe how the Extreme Ultraviolet Variability Experiment will sample and track the Sun's ultraviolet irradiance, providing a detailed time sequence of extreme ultraviolet output -- data that can provide advance warning for potentially disruptive energy bursts.

Expedition 8 Crew Talks to Students in Japan

In this video segment adapted from NASA, students in Matsuyama City, Japan, interview Expedition 8 Commander and NASA Science Officer Mike Foale and Flight Engineer Alexander Kaleri about life and work aboard the International Space Station.

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Explore the Moon

See what it is like to walk on the Moon by viewing this collection of QuickTime images from NOVA Online. Stunning 360-degree panoramas from each of the six successful Apollo Moon landings are featured.

Extreme Temperatures on the Moon

In this video segment adapted from Interactive NOVA, astronaut John Young experiences extreme temperatures on the Moon that are a result of the Moon's low gravity and lack of atmosphere.

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Galileo: Discovering Jupiter's Moons

This video segment adapted from NOVA shows how Galileo, using his newly developed refracting telescope, observed four of Jupiter's moons, the first astronomical bodies to be discovered since ancient times.

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Galileo on the Moon

Watch Apollo 15 astronaut David Scott perform Galileo's falling objects experiment on the Moon in this video segment from NASA.

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Galileo: Sunspots

This video segment adapted from NOVA shows how Galileo used his telescope to carefully observe and study sunspots.

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Gallery of Auroras

View this stunning collection of auroral displays from NOVA Online to find out why auroras appear in different colors and shapes and whether they occur on other planets.

How Big Is Our Universe?

This interactive resource from Harvard Smithsonian Center for Astrophysics uses images and activities to understand the scope and scale of our universe. Featured are technologies used by generations of explorers.

Ingredients for Life: Water

This video segment adapted from NOVA goes on a whimsical journey in search of life forms thriving in extreme conditions on Earth and in outer space. Animations show ice on Jupiter's moon, Europa, and signs that water once existed on Mars.

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James Webb vs Hubble

Compare two space telescopes—the Hubble Space Telescope and its planned successor, the James Webb Space Telescope —in this interactive activity from NASA.

The Lunar Cycle

Students learn about the Moon's changing appearance and how orbital motion causes the Moon’s phases.

Meet Carrie Anderson: Taking on Titan

In this video from NASA, astronomer Carrie Anderson studies Saturn's moon, Titan, using data transmitted from the Cassini space probe.

Meteor Showers

This video segment adapted from NASA uses animation to illustrate the properties of meteor showers and comets. Included is are visualizations of a comet's tail and of Earth passing through a debris stream left behind by meteoroids.

The Moon

This video segment from IdahoPTV's D4K discusses the physical characteristics of the moon, as well as its gravity, and distance form the earth. It includes video of Apollo 15 on the moon.

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Naming Uranus and Neptune, in Hebrew

The Hebrew Language Academy, a government funded institution that coins new Hebrew terms, is letting the public decide the Hebrew names of two planets. Learn why and hear some of the 2000 suggestions and their inspirations in this audio segment from PRI's The World Science Podcast.

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Our Super Star

Students learn basic facts about the Sun, model the mechanics of day and night, and use solar energy to make a tasty treat.

Planets

This video segment from IdahoPTV's D4K reviews the characteristics of the sun and the planets that make up the solar system.

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