Describing The Universe
In Terms Of Time, Distance, And Organization
What Is Astronomy?
The scientific study of the universe. Astronomy is of great value to astronomers, sailors, and everyday people. The stars can be used to navigate through the sea by sailors. Everyday people can also examine the stars to predict the wheater.
Objectives
1.) Identify the visible and non visible parts of the electromagnetic spectrum.
2.)Compare refracting telescopes and reflecting telescopes.
3.)Explain how telescopes for non visible electromagnetic radiation differ from light telescopes.
Vocabulary
Universe
A total existence of meter and energy.
Light year
The distance light can travel in one year.
Astronomical Unit
The distance from the sun to earth.
Refracting telescope
Telescope that uses a set of lenses to gather and focus light from distant objects.
Reflecting telescopes
a telescope that uses a curved mirror to gather and focus light from distant objects.
Electromagnetic spectrum
All The frequencies or wavelengths of electromagnetic radiation.
Describing electromagnetic spectrum
Comparing Refracting and Reflecting telescopes
A reflecting telescope is uses mirrors to gather and focus light from far away objects. The largest reflecting telescopes are located in hawaii, these telescopes are called Keck telescopes. Once the enters the telescope, a large curved telescope reflects the light into a secondary mirror. A refracting telescope uses lenses to gather and focus light from distnat objects. This type of telescope uses clear lenses to bend light. This telescope was developed with a problem; the lens focuses in different colors of light at different distances.