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