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For years, the satellites that make up America's Global Position System have been carrying sensors that measure the weather in space. This image illustrates the orbital planes in which GPS satellites travel around Earth.
Courtesy of Los Alamos National Laboratory
Apollo 1 astronauts Ed White (from left), Gus Grissom and Roger Chaffee, 1967. The astronauts died as a result of a fire in the cockpit during a training session on Jan. 27, 1967.
Keystone/Hulton Archive/Getty Images
An artist's rendering of a black hole that's 2 billion times more massive than our sun. Streams of particles ejected from black holes like this one are thought to be the brightest objects in the universe.