Johannes Kepler. He also did a book on the subject called (Dioptrice) a latinized form. Kepler was the head of the big Danish observatory founded by Tycho Brahe and succeeded him on his death. Tycho died before Telescopes were invented.
Probably Galileo. He is certainly the most famous.
Galileo
Galileo !
scientist study astronomy and when the world ends
Radio Telescope Apex
"I logged onto WikiAnswers, went directly to the Astronomy category, and immediately chanced upon a new question that challenged: 'Use refracting telescope in a sentence' . "
this will be a telescope because a microscope is to look at small things with and a telegraph is basically now a commericial
Galileo
Galileo !
scientist study astronomy and when the world ends
Galileo Galilei.
While not the inventor of the telescope, Galileo is widely believed to be the first person to use a telescope for astronomy.
Galileo
telescope
Galileo
The instrument scientists use to observe the planets is a high powered telescope.
Galileo
My dear friends its the telescope! That was the first instrument (tool) to use to study space and astronomy. For your information.. ( FYI) Galileo was the first man to invent and use the telescope. By the way I'm in the 5th grade but we learn a lot of good astronomy stuff in class. I'm pretty smart
Radio Telescope Apex