Describing The Univers

In terms of time, distance, and organization

What Is Astronomy

Astronomy is the scientific study of the Univers. Studying the Univers is important for the potential benefit to humans. For example, studies of how Stars shine may one day lead to improve of new energy sources on earth.
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Objectives

1. Describe characteristic of the universe in terms of time , distance, and organization.

2. Identify the visible and nonvisible parts of the elctromagentic spectrum.

3. Compare refracting telescope and reflecting telescope.m

4.Explain how telescope for non-visible electromagnetic radiation differ from light telescopes.

Describe the electromagnetic spectrum

The electromagnetic spectrum is all of the frequencies or wavelength of electromagnetic radiation. Visible light is a form of energy that is part of the electromagnetic spectrum the human eye can see only radiation of wavelength in the visible light range of the spectrum.


Electromagnetic radiation that has wavelength that are shorter than the wavelength of violet light or longer than the wavelength of red light can robe seen by humans. These invisible

Wavelength include infrared waves,microwaves, radio waves, ultraviolet rays x rays and gamma ray.



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Refracting and reflecting telescopes

Refracting telescopes have an objective lens that bends 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. Another problem with refracting telescopes is that it is difficult to Mack very large lenses of the required strength and clarity.


Reflecting which curved mirrors to gather and focus light from distant objects. When light enters a refracting telescope, the light is reflected by a large curved mirror to second mirror. The second mirror reflects the light to the eyepiece which is a lens that magnifies and focuses the image.


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Invisible Light Telescopes and Sbace Based Telescopes

Each type of electromagntic radiatoin provides scientist with informatoin about objects in space. scietists have developed telescopes that detect invisibel radiatoin. there are also telescopes that detect gamma ray, xray, and infred rayes. one problem with using telescopes to detect invisible electrmagnetic radiatoin is that the earth's atmoshere acts as a shieled aganinst many forms of electromagnetic radiation.


The huble space telesope is an example of a telescope that has been lacnched into space and mackes remarkably clear images using chandra x-ray odjects in space, suchs as the remnants of exploded stars. the compton gamma ray odservatory is no longer in space but detected gamma ray from objects, such as a black hole.

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