The University of Arizona’s Steward Observatory Mirror Lab is pre-firing its huge spinning furnace and inspecting tons of glass for casting a first 8.4-meter (27-foot) diameter mirror for the Giant ...

When scientists are looking into space, the more they can see, the easier it is to piece together the puzzle of the cosmos. The James Webb Space Telescope’s mirror blanks have now been constructed.

Engineers commanded the James Webb Space Telescope to unfurl its over 21-foot wide golden mirrors this week, and the crucial test succeeded. The test, shown in the image below, was the last check on ...

The James Webb Space Telescope hit another milestone this week; NASA announced that the $10 billion observatory's 18 hexagonal mirror segments and its secondary mirror have been fully deployed. "Just ...

FILE PHOTO: James Webb Space Telescope Mirror unveiling event at NASA's Goddard Space Flight Center in Greenbelt, Maryland ...

NASA has reached a milestone in the development of its newest telescope, Roman, set to launch in 2025, with the completion of its primary mirror. To look at into the depths of space, Roman needs a ...

There's a period of time after the Big Bang, when the universe was in its infancy and the very first stars were blinking into existence, that remains one of the most mysterious chapters in the history ...