When most people think of telescopes, they think of the tube-shaped refractor or reflector telescopes used by amateur astronomer. Others think big and remember that the great Hubble Telescope is out there in space, instead. In fact, there are these and many other different types of telescopes.
The visual, or optical, telescopes have been around the longest. The first refracting telescope was constructed in about 1570. Galileo did some work on it and made it better. He improved it so much in fact that he ended up with a 20-power telescope. With it, he could see some of the moons of Jupiter. Isaac Newton invented the first reflecting telescope about one hundred years after the first telescope, in 1671.
In the 1930s, Karl Jansky was interested in the short-wave radio interference that people doing Trans-Atlantic communications noticed. After much study, he ended up building a rotating radio telescope. With it he discovered how many phenomenons on earth created the static.
However, he also pulled in radio noise from the Milky Way. Radio telescopes need to be very large if they are going to override the earthly radio […]

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