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;
13 Cards in this Set
- Front
- Back
|
Star
|
a large celestial body that is composed of gas and emits light.
|
|
|
Light-year
|
The distance that light travels in one year;about 9.46 trillion kilometers.
|
|
|
red giant
|
a large, reddish star late in its life cycle.
|
|
|
white dwarf
|
a small, hot, dim star that is the leftover center of an old star.
|
|
|
supernova
|
a gigantic explosion in which a massive star collapses and throws its outer layers into space.
|
|
|
black hole
|
an object so massive and dense that not even light can escape its gravity.
|
|
|
galaxy
|
a collection of stars, dust, and gas bound together by gravity.
|
|
|
cluster
|
a group of stars or galaxies bound by gravity
|
|
|
interstellar matter
|
the gas and dust located between the stars in a galaxy.
|
|
|
quasar
|
a very luminous object that produces energy at a high rate; quasars are though to be the most distant objects in the universe.
|
|
|
universe
|
the sum of all space, matter, and energy that exist, that have existed in the past, and that will exist in the future.
|
|
|
Doppler effect
|
An observed change in the frequency of a wave when the source or observer is moving.
|
|
|
Big Bang Theory
|
The theory that all matter and energy in the universe was compressed into an extremely small volume that 13 billion to 15 billion years ago exploded and began expanding in all directions.
|
