Describing The Universe

In terms of time distance and organization

What's Astronomy?

Astronomy is the scientific study of the universe. The value of astronomy to humans is important to them because back then, sailors would use the stars to see where they are traveling or farmers observed changes in daylight throughout the year to track seasons. Nowadays, people study astronomy because they are curious of what is in the universe. It also, gives us new energy resources.


  • Identify the visible and nonvisible parts of the electromagnetic spectrum
  • Compare refracting telescopes.
  • Explain how telescopes for nonvisible electromagnetic radiation differ from light telescopes.

Astronomy Vocabulary

The Electromagnetic Spectrum

The electromagnetic spectrum are all the frequencies or wavelengths of electromagnetic radiation. The visible radiation can be seen by the human eye because the visible light is broken into different colors because each color has a different wavelength. The shortest wavelength of the visible light are blue and violet. The longest wavelengths are orange and red. Then, there is the Invisible Radiation and it can't be seen by the human eye because the wavelengths are shorter than the wavelengths of violet light or longer than the wavelengths of red light. The Invisible wavelengths include Infared Waves, Microwaves, X-Rays, and Gamma Rays. Since you can't see this with the naked eye we use special instruments.

Refracting & Reflecting Telescopes

Reflecting and Refracting Telescopes are special instruments to gather light from distant objects the Refraction Telescopes has an an objective lens that bends the light that passes through the lens and focuses the light to be magnified by an eyepiece. A problem is that the lenses focuses different colors of light at different distances. Another problem is that its difficult to make a very huge lense of the required strength and clarify. Another telescope is the Reflecting Telescope, they have curved mirrors that makes the light reflect by a large curved mirror to a second mirror. The second mirror reflects the light to the eyepiece, magnifies and focuses the image. The Reflecting Telescope can be larger and can gather more light than the Refracting Telescope.

Invisible Light & Space-Bound Telescopes

Scientists build many telescopes to study and figure out what lays in the Universe. Scientists have The Invisible Light Telescope. The only problem is that Earth's Atmosphere is a shield against many forms of electromagnetic radiation. On the other hand, Ground-Based Telescopes work best when it's at high elevation and when theatrics mostly dry. These telescopes provide scientist with enough information about other things in space. Also, water vapor prevent Gamma Rays, X-Rays, but mostly Infrared and Ultra Violet Rays. Another telescope is the Space-Based Telescope. For example, the Chandra X-Ray Observatory,that telescope makes clear images using the x-rays from objects from Space. Another example can be the Compton Gamma Ray Observatory that one is not in space anymore but it used to detect Gamma Rays from Objects such as Black Holes. These telescopes help astronomers learn valuable information from Space.

In Retrospect, Earth's Atmosphere cannot interfere with the detection of any Electromagnetic Radiation and with that said they announced that the James Webb Space Telescope will be launched in the year 2014.