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How do telescopes work?

A modern astronomical telescopeA telescope is an instrument that makes distant things appear closer. It enables us to see details that are not visible with the naked eye. Binoculars are made up of two telescopes, one for each eye. Astronomers use powerful telescopes to study objects in space. They are specially designed to collect as much light as possible. Images from these telescopes reveal details of the Moon, planets, nebulae (clouds of dust or gas) and galaxies that we cannot see simply by looking up at the night sky.



This telescope uses a concave (dish-shaped) mirror called a primary mirror to collect the light from the object. It focus the...Read More >>This telescope uses a concave (dish-shaped) mirror called a primary mirror to collect the light from the object. It focus the light on to a smaller mirror, called a secondary mirror. From there, the image is reflected on to a sensor, which then sends it to a computer.

Reflectors

The Hubble Space Telescope is so sensitive it could detect light from a torch 400,000 kilometres (250,000 miles) away.

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