Telescopes+-+By+Tahlia

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In 1609 a Dutch eye glass maker began making a telescope. The first telescope was made by Galileo Galilei, he noted "Bringing my eye to the concave lens, I saw objects satisfactorily large and near". During the years he saw craters on the moon, sunspots on the sun, Saturn's rings and Jupiter's four moons.

Astronomers have developed telescopes that allow them to see radio waves,microwaves,ultra violet,infrared radiation, x-rays and gamma rays.

Optical telescopes come in two variety's, refracting and reflecting. Refracting: Which use lenses to focus light directly into the eyepiece. Reflecting: Which bounce light off mirrors before sending it to the eyepiece. Most older telescopes are the refracting type of optical. Big telescopes are reflecting such as the Hale telescope in Mount Palomar, California. This telescope can gather tremendous amounts of light. media type="custom" key="4592804"

Other telescopes like the radio telescope's are directional antennas. Radio telescopes are used to collect microwave radiation, which is used to collect radiation when any visible light is obstructed or faint. Most radio telescopes are used by SETI and the Arecibo Observatory to search for exterrestrial life.

High-energy astronomy requires specialized telescopes to make observations since most of these particles go through most metals and glasses.

List of telescopes: - Optical telescopes - Optical reflecting telescopes - Optical refracting telescopes - Radio telescopes - Space telescopes - Solar telescopes - Cosmic-ray telescopes - Gamma-ray telescopes - Gravitational wave telescopes - High energy particle telescopes - Infrared telescopes - Submillimetre telescopes - Ultraviolet telescopes - X-ray telescopes