Chapter 20 Vocad Words Flashcards
Stars
A large celestial body that is composed of gas and that email light, the sun is a typical star.
Light year
The distance that light travels in one year, about 9.5 billion km.
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 it outer layer 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
Quasi stroller radio sources; very luminous objects that produce energy at a high rate and that are thought to be the most distant objects in the universe.
Universe
The sum of all space, matter, and energy that exit, that have existed in the past, and that will exist in the future.
Red shift
An apparent shift toward longer wavelengths of light caused when a luminous object moves away from the observer
Blue shift
An apparent shift toward shorter wavelengths of light caused when a luminous object moves toward the observer.
Big Bang theory
The theory that all matter and energy in the universe was compressed into an extremely small volume that 10 to 20 billion began expanding in all directions.
