The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... The Universe contains billions of galaxies, each containing millions or even trillio...
A telescope is an intrument that collects light-far more than a human eye can-from faraway objects and then magnifies them. Telescope have evolved from simple models that could see nearby objects in space, such as the Moon, to powerful instruments that can detects light from stars billions of light years away.
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Optical telescopes Optical telescopes mainly detects visible light. They have two main parts-an objective (or primary) lens or mirror, which collects and focuses light from a distant object, and an eyepiece to look at the image of the object. Most astronomical telescopes use mirrors.
Adaptive optics Moving air in the atmosphere blurs light from stars. Some large professional telescopes use a system called adaptive optics to fix this problem. They fire a laser beam to a height of about 100 km (62 miles), where it makes gas glow. Blurring of light from the gas is measured by a sensor and from from this a computer Learns how to adjust a special bendable mirror that reflects and sharpens up the images.
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Radio telescopes Radio telescopes can be turned to particular radio wavelengths. They can detect radio waves given off by by objects in space and can convert the waves into images using computers.
