James Webb Telescope Engineering: Optics at the Dawn of Time

Explore the mega-engineering behind the James Webb Space Telescope. Learn how gold-coated beryllium mirrors, a 5-layer Kapton sunshield, and 7-Kelvin cryocoolers peer into cosmic dawn 1.5 million kilometers from Earth.

Star S301 at 25,000 km/s: Einstein’s Test Around Sagittarius A*

Discover star S301, detected by the ESO racing at 25,000 km/s (8.5% of light speed) around supermassive black hole Sagittarius A*. Learn how its orbit unlocks the black hole’s spin and tests Einstein’s General Relativity.