[Hank Green] posted an interesting video about the first liquid mirror telescope from back in the 1850s. At the time, scientists were not impressed. But, these days, people are revisiting the idea.

The telescope can peek into the past, learning how the universe looked 13 billion years ago. It uses real gold-plated mirrors to pierce through the vastness of the cosmos. Telescope mirrors ...

The central feature of the telescope is an exquisitely polished, concave primary mirror, 2.4 meters (7.9 feet) in diameter. The primary mirror sits beneath a smaller, secondary mirror that ...