Even taking that into consideration, a liquid mirror telescope poses far fewer logistical problems than a conventional reflecting telescope made of glass. (science.howstuffworks.com)
By the middle of the 20th century, reflecting telescopes ran up against the same problem. (kavliprize.org)
But NASA is also considering a more intriguing solution — a special type of reflecting telescope that uses a liquid, not glass, as the primary mirror. (science.howstuffworks.com)