Big Bang Theory

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19 Terms

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Big Bang Theory
The theory that the universe originated in a huge explosion that released all matter and energy.
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Doppler Effect
A change in sound frequency caused by the motion of the source moving toward or away from the observer.
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Red Shift
The change in the wavelength of light due to an object moving away from the observer.
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Cosmic Background Radiation
The electromagnetic radiation left over from the big bang
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Time of Big Bang
10-15 billion years ago
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Age of Universe
about 14 billion years old
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First two elements created
Hydrogen and Helium
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Composition of Early Universe
75% Hydrogen and 25% Helium - Evidence for the Big Bang because current measurements match with the predicted composition of the universe.
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Wavelength
Distance from one point on a wave to the same point on another wave
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Galaxy
Groups of billions of stars and the planets that orbit them (the stars)
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Solar System
Planets in space that are bound together by gravity and orbit a star.
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Our galaxy
Milky Way
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Universe
All existing matter, energy, and space
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Edwin Hubble
Discovered many things one of which is that galaxies are moving away from us and those that are farthest away are moving the fastest
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Singularity
point where all matter, space and time was condensed before the Big Bang
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Nucleosynthesis
the natural formation of elements as a result of fusion during big bang, in stars, and from supernovas
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Life Cycle of Stars
The process by which a star changes during its lifetime. This depends on the mass of the star.
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Blue Shift
the displacement of the spectrum to shorter wavelengths in the light coming from objects moving toward the observer.
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Age of Sun
4\.6 billion years