The Observatory

Gran Telescopio Canarias, or GTC, the biggest optical telescope in the world, Roque de Los Muchachos observatory, La Palma
February 10, 2008

  Twinkling stars are pretty, but astronomers would much rather they didn’t. The twinkle is caused by movement in the air above you (the same as a mirage on very hot days) and it stops the astronomers getting a clear view. The Hubble Telescope gets such wonderfully clear images because it’s out of the atmosphere altogether. But there’s only one Hubble, and it cost a fortune. So they build ground-based…