Hubble cracks up

 作者:家鸽醭     |      日期:2019-03-06 08:08:01
The Teflon coating on the Hubble Space Telescope’s outer casing is cracking up. NASA didn’t expect to see a problem for 10 to 15 years, but cracks began to show on the thermal protection material in 1993, just three years after the launch. In tests at NASA’s Glenn Research Center in Ohio, Kim de Groh found out why: radiation makes Teflon brittle, leaving it less able to withstand the hot and cold extremes of space (High Performance Polymers, vol 13,