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Interested in information on telescopes? Check out this interactive learning module. Also check out our links to other pages on space and the solar system.

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Telescope is a device for "seeing faraway things as though nearby". Galileo invented the telescope, in the early 1600s, he even discovered four of Jupiter's moons. We can see some planets without a telescope too.

The planet Mars is the fourth planet from the sun and is called as "the Red Planet," can be seen at night from the Earth without a telescope. Another planet Jupiter that is the largest among the nine planets can also be seen without a telescope. From Earth it looks like a star.

Telescopes are constructed with giant mirrors or lenses so that they can collect more light than the human eye can see on its own. How a telescope collects and concentrates light?

The convex lens or the concave mirror present in the telescope collects light. The bigger the convex lens or the concave mirror, the more light it can collect. The more light it collects, the fainter the objects it allows us to see. The human eye has a convex lens, which can only collect a small amount of light because the lens is small. Telescopes allow us to see more because their mirrors and lenses can collect more light than the human eye can collect on its own.

Therefore, astronomers use several light-gathering tools to probe the universe from our planetary neighbors to the deepest regions of space and time.


Books about Telescopes

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Links to other sites about Telescopes

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Space Facts
How Telescopes Work
Hubble Space Telescope

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