Viewing Astronomy
Descriptive vocabulary
What is astronomy?
Objectives
Identify the visible of the electromagnetic spectrum.
Compare refracting telescopes and telescopes.
Explain how telescopes for nonvisble electromagnetic radiation differ for light telescopes.
Refracting telescope
A refracting telescope is a telescope that uses a set of lenses to gather and focus light from distance objects.
Reflecting telescope
Reflecting telescope is a telescope that uses a curved mirror to gather and focus a Light from distance objects.
Astronomical unit
Astronomical unit is the average distance between the earth and the sun approximately 150 million kilometers.
Galaxy
Galaxy is a collection of stars,dust,and gas bound together by gravity.
Light year
Astronomers also use the speed of light to measure distance light year travels at 300,000km/s. In one year ,light travels 9.46x10km. This distance is known as light year.
Electromagnetic spectrum
Electromagnetic spectrum is all of the frequencies or wavelengths of Electromagnetic spectrum radiation.