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Backyard stargazers get a monthly guide to the northern hemisphere’s skywatching events with “Tonight’s Sky.” In April, Saturn reaches its closest point to Earth, the Big Dipper overflows with cosmic sights, and the Lyrid meteor shower streaks the sky. “Tonight’s Sky” is produced by HubbleSite.org, online home of the Hubble Space Telescope. This is a recurring show, and you can find more episodes — and other astronomy videos — at HubbleSite.org.... Read More إقرأ المزيد | Share it now!

The digital camera in your home shares a family tree with the James Webb Space Telescope. Webb’s instruments use “detectors,” similar to the sensors in digital cameras, to convert images into a digital signal. At the Jet Propulsion Laboratory in California, the detectors are undergoing temperature and vibration testing.... Read More إقرأ المزيد | Share it now!

The Webb Space Telescope’s orbit will place it out of reach of astronauts, so it’s important to have perfect control of the telescope from Earth. At Northrop Grumman, engineers are testing the telescope’s responses to controllers and simulating the conditions it’ll face in space.... Read More إقرأ المزيد | Share it now!

Webb’s giant primary mirror is its most striking feature, but several more mirrors help control the flow of light through the telescope. Meet the secondary, tertiary, and fine-steering mirrors.... Read More إقرأ المزيد | Share it now!

The Webb Space Telescope’s mirror has nearly seven times the area of the Hubble Space Telescope’s. In order to launch it into space, the mirror is made out of segments that will be folded up inside the rocket that carries it into orbit. At Marshall Space Flight Center, segments are being tested in the vacuum chamber to expose them to space temperatures.... Read More إقرأ المزيد | Share it now!

The Webb Space Telescope will need to be extraordinarily cold in order to see the infrared light from the farthest reaches of the universe. Webb’s enormous sunshield will protect the telescope’s instruments from the Sun’s energy.... Read More إقرأ المزيد | Share it now!

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