Go outside right now. What’s the farthest thing you can see? A tree? A bird? What about the Moon? It’s 250,000 miles away. The Sun is 400 times farther than that, at nearly 100 million miles (but ...

On April 24, 1990, NASA and the European Space Agency launched an astronomical revolution. When the Space Shuttle Discovery roared into the sky on that day, it carried the Hubble Space Telescope in ...

The telescope began as a relatively simple device, born out of optical experimentation. It combined a series of lenses and mirrors to collect and magnify light, allowing the user to see far away ...

For most of us who are not astronomers, the image that comes to mind when describing a reflecting telescope is of a huge instrument in its own domed-roof building on a mountain top. But a reflecting ...

The universe holds endless mysteries, and today’s most powerful telescopes are helping us explore them like never before. These advanced instruments drive the progress of modern astronomy, using radio ...