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10 terms

Space Systems Vocabulary

Vocabulary Flashcards
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Light Years
- the distance light travels in one year.
Galaxy
- made up of a cluster of stars. Shapes are disk irregular, and elliptical.
Big Bang Theory
- states that all galaxies are originated from one huge mass of densely packed matter.
Red Shift
- a shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.
Universe
- all matter and energy that exists in space.
Star
- a star is a massive, luminous ball of plasma held together by gravity. The nearest star to Earth is the Sun, which is the source of most of the energy on the Earth.
Nebulae
- a cloud in outer space consisting of gas or dust that forms after a star explodes.
Herztsprung-Russell Diagram (H-R Diagram)
- two astronomers plotted the data of stars on a chart according to their surface temperature and brightness.
Sun
- a medium-sized star near the edge of a disk-shaped galaxy.
Magnitude
- another word for brightness.