Each primary mirror weighs 17-metric tons and is supported by a highly specialized pneumatic support system which is housed ...

Construction of the world's largest telescope moves forward with progress of the structure's dome and housing for the primary mirror. The European Southern Observatory's (ESO) Extremely Large ...

Wednesday saw the observatory's secondary mirror locked into position on the end of three 8m-long booms. It sets the stage for the all-important unpacking of Webb's giant primary mirror - the ...