Describing the universe

In terms of time, distance, and organization.

What is astronomy?

Astronomy is the branch of physics that studies celestial bodies and the universe as a whole.

Studying the universe is important for the benefits of humans for example studies of how stars shine may one day lead to improve a new energy sources on earth.

Astronomers have made existing discover such as new planets, stars, black holes, and nebulas.

Studying this objects astronomers have learn more about the origin of earth and the processes involved in the formation or our solar system.


1.Identify the visible and no visible parts of the electromagnetic spectrum.

2. Compare refracting telescopes and reflecting telescopes.

3. Explain how telescopes for no visible electromagnetic radiation differ from light telescopes.

Atronomy vocabulary

Describe the electromagnetic spectrum

The electromagnetic spectrum is all the frequencies or wavelengths of electromagnetic radiation,electro magnetic radiations are light, radio waves, and x-rays. The radiation is composed of traveling waves of electric and magnetic fields that oscillate at fixed frequencies and wavelengths.
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Compare the reflecting and refracting telescope

The reflecting telescope is a telescope that uses a curved mirror to gather and focus light from distant objects, when light enters to a second mirror, the second mirror reflects the light to the eyepiece, which is a lens that magnifies and focuses the image.The reflecting telescope have an objective lens that bens light that passes through the lens and focuses the light to be magnified by an eyepiece, one problem with refracting telescopes is that the lens focuses different colors of light at different distances.
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Invisible light telescopes

Electro magnetic radiation provides scientist with information about objects in space, scientist have developed telescopes that detect invisible radiation, a radio telescopes detects radio waves. There are also telescopes that detect gamma rays,x rays, and infrared rays. One problem whit using telescopes to detect invisible electromagnetic radiations is that earth's atmosphere act as a shield against many forms of electromagnetic radiation. Water vapor can prevent gamma rays x-rays and most inferred and ultraviolet rays. Ground-based telescopes that are used to study this forms of radiation work best at high elevations where the air is dry. The only way to study many forms is from space.

Ground-based telescopes have been critical in helping astronomers learn about universe, valuable information has also come from spacecraft. Spacecraft that contain telescopes and other instruments have been launched to investigate planets, stars and other distant's atmosphere cannot interfere with the detection of electromagnetic radiation.

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