· Telescope was invented by Hans Lippershey who was a Dutch in 1608.
· Galileo first used the telescope for space exploration.
· Now days, the telescopic observations are viewed on computer screen and rarely astronauts actually see through the telescope eyepiece.
· Telescopes with Gamma rays can detect light emitting from space explosions.
· Telescopes can be reflector or refractor.
· Hubble is the most famous telescope.
· Hubble was launched by NASA in 1990.