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21 Cards in this Set
- Front
- Back
BLACK HOLE
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*object with such a strong gravitational pull that no matter or energy can escape from it
* final stage of evolution for high mass star |
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BLACK DWARF
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* white dwarf that has sufficiently cooled to no longer emit significant heat or light
* final stage of evolution of low mass star |
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MAIN SEQUENCE STAR
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* stage in the evolution of a star
* outward pressure from the hot core balanced with inward force of gravity |
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NEBULA
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* a cloud of interstellar dust and gas where stars are formed
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NEUTRON STAR
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* Extremely dense remnant of a star that has collapsed under its own gravity
* spins rapidly * when it emits pulses of energy detected by Earth we call it a Pulsar |
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NUCLEAR FUSION
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* process in which lighter atoms combine and form heavier atoms releasing a great amount of energy
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PROTOSTAR
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* Early stage in the formation of a star
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RED GIANT / RED SUPERGIANT
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* red-colored star in which pressure and gravity are no longer in balance
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WHITE DWARF
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* small, dim, extremely dense star that has collapsed on itself
* stage prior to black dwarf for low mass star |
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GALAXY
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* system made up of stars, interstellar gas/dust and dark matter
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CLUSTER
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* groups of galaxies
* Milky Way (our galaxy) is in the cluster called the Local Group |
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DARK MATTER
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* theorized form of matter – can’t be seen - has a gravitational pull which affects the things around it
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SPIRAL GALAXY
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* disk with arms - shaped like a pinwheel
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ELLIPTICAL GALAXY
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* smooth round/oval shape – no arms
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IRREGULAR GALAXY
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* no particular shape
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BULGE
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* mass of old stars found in center of galaxy
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DISK
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* flattened region around bulge in spiral galaxy, contains mostly younger stars
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HALO
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* outer region of galaxy containing older stars, gas and dust
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SPIRAL ARMS
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* extensions from bulge giving spiral galaxies their pinwheel appearance, mostly young stars
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ASTRONOMICAL UNIT
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* A.U.
* unit used to measure distances in the solar system * = mean distance from Earth to Sun * 93 million miles / 150 million km |
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LIGHT YEAR
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* ly
* unit used to measure distance in space * = the distance light travels in 1 year * 9.46 (10) trillion km /5.88 (6) trillion miles |