Thousands of satellites circle Earth. Some look down, taking pictures and gathering all sorts of information about our planet. Others look out into space, toward the planets, the Sun, and the unknown worlds beyond our galaxy. In addition to recording what is seen, satellites...
A Soccer fan watches a live broadcast of a game being played halfway around the world. A meteorologist studies photos of a hurricane developing out at sea. Astronomers observe evidence of a black hole millions of light years from Earth. What do all these people have in common?...