A rare look at NASA’s next sharp-eyed space telescope
NASA's Roman Space Telescope is preparing for launch in 2027, with a mission to study distant galaxies and explore dark energy.
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 ...
Mashable3y
Why Webb's unassuming secondary mirror makes it a telescope
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