Describe the Universe
In terms of time, distance, and organization a
What is Astronomy?
Objectives
2. Identify the visible and nonvisible parts of the electromagnetic spectrum.
3. Compare refracting telescopes and reflecting telescopes.
4. Explain how telescopes for nonvisible electromagnetic radiation differ from light telescopes.
Astonomy Vocabulary
Universe
The universe contains galaxies such as our own The Milky Way galaxy. Astronomers haven't found out if their might be more galaxies out there.
Light year
Because the universe is so large, the units of measurement used on earth are too small to represent the distance between objects in space. Light travels at 300,000 km/s.
Astronomical Unit
The average of distance between the earth and the sun; approximately 150 million kilometers. One astronomical unit can only measure from the sun to earth.
Electromagnetic Spetrum
The Electromagnetic spectrum is all of the frequencies or wavelengths of electromagnetic radiation. Light, radio wave, microwaves, infrared, visible, ultraviolet, X-ray, and gamma ray.
Refracting Telescope
Refracting telescopes is a telescope that uses a set of lenses to gather and focus light from distant objects.
Reflecting Telescope
Reflecting telescopes is a telescope that uses a curved mirror to gather and focus light from distant objects.