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5-14 Early Telescopes

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Early Telescopes

  Astronomy, the study of the heavens can be dated back to 1609.  In the winter of that year in Padua, Italy, a professor of mathematics, Galileo Galilei, made a telescope.  He became the first person to see the mountains on the Moon, the four large moons of Jupiter, and the phases of Venus.  His observations helped convince him and others that the Sun, and not the Earth, was the center of our planetary system.

  Galileo's telescope used a pair of lenses to gather light and produce a magnified view of the heavenly bodies.  This type was called a refractor, because the path of light was refracted, or bent, as it passed through the lenses.  Galileo left many sketches and detailed notes as a pioneer of astronomy.

  The early refractors, suffered from several defects, which blurred the image.  To improve the image quality, an English scientist Isaac Newton in 1668 built a telescope that used a concave (dish-shaped) mirror to gather and focus light.  This telescope was a great advance because it did not suffer from lens defects.  This type of telescope, called a reflector, is the one used mostly by astronomers today.  

 

Answer the questions below

 

1. Galileo Galilei's observations convinced himself and others that
 

the Earth was the center of our planetary system.

the Sun was the center of our planetary system.

our planetary system has nine planets.

 

2. Astronomy can be dated back to the year .

 

3. Galileo Galilei was a professor of .

 

4. Galilei's telescope was called a because the path of light was bent as it passed through the lenses. 

 

5. In 1668 Isaac Newton built a telescope that used a 
 

concave mirror to gather and focus light.

refractor.

reflecting mirror to gather and focus light.

 

6. Early refractors suffered several defects which the image.

 
7. In 1609 the first telescope was invented by Galileo Galilei in 
 
Madrid, Spain.

London, England.

Padua, Italy.

 
8. Today most astronomers use a telescope called a 
 
refractor.

mirror.

reflector.

 
9. Isaac Newton was an scientist.
 
10. The study of the heavens is called .

 

 

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