Rendezvous with SOFIA – Part 1
Into the Stratosphere
The Earth’s atmosphere is an ocean of water vapour. To the frustration of astronomers, this moisture in our atmosphere impedes observations of stellar objects in the infrared range of the electromagnetic spectrum. Launching telescopes into space is one way to ensure clear views, but it comes at a price. For instance, the 1980s instrumentation aboard the Hubble space telescope cannot easily be updated because it flies around the Earth at 8 kilometres per second. Another example is the Spitzer and WISE telescopes suffering a limited lifetime due to their small supply of cryogenic coolant.