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Modern Astronomy
Question | Answer |
---|---|
The big bang theory | The theory that the universe originated in a huge explosion that released all matter and energy 13.7 Billion years ago |
red shift and blue shift | a shift of spectral lines toward the red end or blue end of the electromagnetic spectrum. Red shift indicates something is moving away |
cosmic background radiation | leftover energy from the big bang |
constellation | A group of stars that form a pattern in the sky |
H-R diagram | a graph that shows the relationship between a star's surface temperature and absolute magnitude |
nuclear fusion | The process by which two or more small nuclei fuse to make a bigger nucleus |
Nebula | A large cloud of dust and gas in space |
star | A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion. |
Gravity | A force that pulls objects toward each other |
black hole | An object in space whose gravity is so strong not even light can escape. |
red giant | A large, reddish star late in its life cycle |
galaxy | A collection of stars, dust, and gas bound together by gravity |
universe | Space and all the matter and energy in it |