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The Universe
Unit 6 Flash Cards
37
Astronomy
8th Grade
03/01/2013

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Cards

Term
Apparent Magnitude
Definition
appears to be the brightest star
Term
Absolute Magnitude
Definition
Absolutely the brightest
Term
Big Bang Theory
Definition
Model that describes the developement of the universe
Term
Black Hole
Definition
Region of space from which gravity prevents anything, including light from escaping
Term
Constellation
Definition
named pattern of stars
Term
Electromagnetic Radiation
Definition
Energy that travels through space in the form of waves
Term
Electromagnetic Spectrum
Definition
A range of electromagnetic waves placed in order of wavelength
Term
Electromagnetic Wave
Definition
A transverse wave that transfers electric and magnetic energy
Term
Elliptical Galaxy
Definition
Galaxy shaped like a flattened ball that can contain mostly old stars
Term
Galaxy
Definition
systems consisting of stars, steller remnants, and interstellar medium of gas and dust
Term
Gamma Ray
Definition
Electromagnetic radiation with the shortest wavelength and highest frequency, used in atomic science
Term
Hertzsprung-Russell Diagram
Definition
Graph relating the temperature and brightness of stars
Term
Infrared
Definition
Electromagnetic waves with shorter wavelengths and higher frequencies that microwaves, used in heating
Term
Irregular Galaxy
Definition
A galaxy that does not have a regular shape (ex. not elliptical or spiral)
Term
Light Years
Definition
The distance light travels in one year
Term
Main Sequence
Definition
Area on the HR Diagram that contains 90% of all stars
Term
Microwave
Definition
Electromagnetic waves between radio and infrared used in cell phones and microwave ovens
Term
Nebula
Definition
a large amount of gas and dust in space spread out in an immense volume
Term
Nova
Definition
A cataclysmic nuclear explosion in a white dwarf star
Term
Observatory
Definition
Building that contains one or more telescopes
Term
Parallax
Definition
change in teh apparent position of an object viewed from different places
Term
Photon
Definition
A tiny particle or packet of light energy
Term
Pulsar
Definition
A neutron star that produces radio waves
Term
Radio Wave
Definition
Electromagnetic wave with the longest wavelength and lowest frequencies
Term
Spectrograph/Spectroscope
Definition
An instrument that breaks light from an object into colors and photographs the resulting spectrum
Term
Spectroscopy
Definition
the dispersion of an object's light into it's component colors
Term
Spiral Galaxy
Definition
A galaxy whose arms curve outward in a pinwheel pattern
Term
Star
Definition
A massive, luminous sphere of plasma held together by gravity
Term
Universe
Definition
All of space and everything in it
Term
Ultraviolet Radiation
Definition
Electromagnetic radiation with a wavelength shorter than visible light but longer than X-Ray, causes sunburn
Term
Vacuum
Definition
Space that is empty of matter
Term
Visible Light
Definition
Electromagnetic radiation that can be seen with the unaided eye
Term
White Dwarf
Definition
The remaining hot core of a star after its outer layers have expanded and drifted out into space
Term
X-Ray
Definition
Electromagnetic waves with higher frequencies than ultraviolet rays but lower frequencies than gamma rays, used to take pictures of bones
Term
Red Giant
Definition
Luminous giant star of low or imtermediate mass in a late phase of stellar evolution, low temperatures
Term
Blue Giant
Definition
Hot intermediate mass stars that have passed though a red giant phase and are now burning helium in their cores
Term
Neutron Star
Definition
type of stellar remnant that can result from the gravitational collapse of a massive star during a super nova event
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