Submarine hot springs, called hydrothermal vents, spew out mineral-rich hot water. What do scientists hope to learn by tracking the temperature variations around these vents for an entire year?

From Pennsylvania to the Pacific Ocean and back again. Experience the final day of an expedition to study deep sea vents with this eyewitness account, and learn what came of the research.

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?

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.

Cosmos, Contact, Icarus and Billions and Billions—from TV and movies to professional journals and best-selling books, Carl Sagan's influence was legendary.

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.

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.

This Hawaiian tenth-grader followed her interest in the Pacific golden plover to Alaska. The goal of her trip? To learn if the birds deliberately or randomly select the location of their nest cups.

While planting strawberries in her backyard, this freshman from New Mexico discovered a fossilized seashell. Follow along as she searches for evidence of her state's watery past.

Armed with mug shots of New York's top 20 plant invaders, this junior began an expedition in her backyard. How many of these non-native invasive plants had already gained a foothold?