Educators

Case Study: Fossil Microbes on Mars?

Online Resource, Article

Case Study: Fossil Microbes on Mars?

A meteorite that escaped from Mars 16 million years ago was found recently in Antarctica. Does it, or doesn't it, hold evidence that proves the existence of life on the red planet?

Case Study: Neutrino Observatories

Online Resource, Article

Case Study: Neutrino Observatories

Update your image of astronomers. Today they spend most of their time peering into computer screens rather than through the eyepiece of a telescope. Learn what this new vantage point has gained them.

Case Study: The Cosmic Microwave Background Radiation

Online Resource, Article

Case Study: The Cosmic Microwave Background Radiation

At this distance in time and space, can we prove that the universe was created with a single explosion? See how scientists have detected a faint remnant glow that supports the Big Bang theory.

Profile: Ernst Chladni and Rocks from the Sky

Online Resource, Article

Profile: Ernst Chladni and Rocks from the Sky

Today, we accept the notion that enormous rocks exist within our solar system and that some of them fall to Earth. A little over 200 years ago, though, this idea garnered skepticism and ridicule.

Case Study: John Michell And Black Holes

Online Resource, Article

Case Study: John Michell And Black Holes

Imagine gravity so strong that even light is contained by its force. When a country parson first described black holes in 1783, the concept was so ahead of its time that it was mostly ignored.

Cindy Lee Van Dover

Article

Cindy Lee Van Dover

For oceanographers, the work they do at sea is just the beginning. Learn more about the discoveries made by one scientist who completed more than 100 dives to the sea floor.

Profile: Ole Roemer and the Speed of Light

Online Resource, Article

Profile: Ole Roemer and the Speed of Light

While studying one of Jupiter's moons, Ole Roemer happened upon the first good estimate of the speed of light. Before his 1676 discovery, scientists assumed that light could not be measured.

Profile: Vera Rubin and Dark Matter

Online Resource, Article

Profile: Vera Rubin and Dark Matter

For every visible star in the observable universe, there are nine masses that are invisible and unidentified. Learn more about the astronomer who proved the existence of dark matter.

Profile: Lyman Spitzer and the Space Telescope

Online Resource, Article

Profile: Lyman Spitzer and the Space Telescope

The idea of launching a telescope into orbit was first suggested in 1923, but the idea wasn't realized until nearly 70 years later. Along the way, there were several obstacles and setbacks.

Profile: Fritz Zwicky's Extraordinary Vision

Online Resource, Article

Profile: Fritz Zwicky's Extraordinary Vision

Astronomer Fritz Zwicky was the first person to conceive of supernovas, neutron stars, dark matter, and gravitational lenses. So why don't more people know his name?

How the Sun Works

Activity

How the Sun Works

Talk about a long-term power source. For billions and billions of years, the Sun has been giving off energy that equals 4 x 1026 watts. What keeps the Sun burning so bright?

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