Greek Reporter4d
Did the Ancient Greeks Have Telescopes?
Evidence suggests ancient civilizations, including the Greeks, may have had early optical knowledge and devices like ...
Mashable3y
Why Webb's unassuming secondary mirror makes it a telescope
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PBS3y
Two Types of Telescopes
Instead of a concave lens near the eye ... This was the first working reflecting telescope. Other designers proved unable to grind mirrors with a regular curvature, so the reflector remained ...
Hosted on MSN1mon
A rare look at NASA’s next sharp-eyed space telescope
The central feature of the telescope is an exquisitely polished, concave primary mirror, 2.4 meters (7.9 feet) in diameter. The primary mirror sits beneath a smaller, secondary mirror that ...