Hubble Space Telescope Mirrors are Made with what kind of glass?

5 Comments

1. campbelp2002 says:

   April 7, 2011 at 2:13 am

   Hubble’s mirrors are made of ultra-low expansion glass.
2. rahdi says:

   April 7, 2011 at 3:00 am

   Hubble Space Telescope Mirrors are Made with Borosilicate glass

   Borosilicate glass has a very low thermal expansion coefficient, about one-third that of ordinary glass. This reduces material stresses caused by temperature gradients, thus making it more resistant to breaking and with its superior durability, chemical and heat resistance this glass finds excellent use in chemical laboratory equipment, telescope mirrors, where it is essential to have very little deviation in shape