Unit 7 /Waves and the Universe

STUDY
PLAY
Frequency
How many wave peaks pass a certain point per given time
H-R Diagram
A graph of star magnitude (brightness) and luminosity (temperature)
Asteroid
Rocky objects revolving around the sun that are too small and numerous to be considered planets
Atmosphere
The envelope of gases surrounding the earth or another planet.
Big Bang Theory
The theory that the universe originated in a huge explosion that released all matter and energy.
Electromagnetic Spectrum
All of the frequencies or wavelengths of electromagnetic radiation
Galaxy
A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
Light Year
Distance light travels in one year.
Luminosity
The actual brightness of a star
Oscillating Theory
The theory that the expanding universe will reach a maximum size, then start to contract again.
Radiation
Energy that is radiated or transmitted in the form of rays or waves or particles.
Visible Light Spectrum
The portion of the electromagnetic spectrum that is visible to the human eye (ROY G. BIV)
Wavelength
Distance between crests and waves
Magnitude
Greatness of size, strength, or importance
Star
A celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
Nebula
A large cloud of dust and gas in space
Universe
All of space and everything in it
Astronomical Unit
The average distance between Earth and the sun, about 150 million kilometers
Component
A part or element of a larger whole.
Meteor
A meteoroid that burns up in Earth's atmosphere
Solar System
Sun, planets, and all the other objects that revolve around the sun

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