🌌 NASA Astronomy Picture of the Day
HET: The New Largest Optical Telescope
Date: 1996-12-27

Explanation:
Most of our universe is too dim to see. To
peer into our cosmos' unknown depths, astronomers must deploy
new tools - and the classic new tool is a larger telescope. Pictured
above is the new Hobby-Eberly Telescope (HET) which recently declared "first light"
in western Texas. HET currently has the largest single mirror of any optical telescope --
11 meters in diameter. Telescopes in space, like the Hubble Space Telescope,
are much smaller but avoid the Earth's atmosphere blurring out
fine detail. HET's
huge size, on the other hand, allows it to see very dim objects
and determine their spectrum. HET's unusual design
allows the primary mirror to stay put during an observation!
Only smaller focusing instruments suspending above the primary
move to track an astronomical object.







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