Big Bang Theory

The theory that the universe originated in a huge explosion that released all matter and energy.

A change in sound frequency caused by the motion of the source moving toward or away from the observer.

The change in the wavelength of light due to an object moving away from the observer.

The electromagnetic radiation left over from the big bang

10-15 billion years ago

about 14 billion years old

Hydrogen and Helium

75% Hydrogen and 25% Helium - Evidence for the Big Bang because current measurements match with the predicted composition of the universe.

Distance from one point on a wave to the same point on another wave

Groups of billions of stars and the planets that orbit them (the stars)

Planets in space that are bound together by gravity and orbit a star.

Milky Way

All existing matter, energy, and space

Discovered many things one of which is that galaxies are moving away from us and those that are farthest away are moving the fastest

point where all matter, space and time was condensed before the Big Bang

the natural formation of elements as a result of fusion during big bang, in stars, and from supernovas

The process by which a star changes during its lifetime. This depends on the mass of the star.

the displacement of the spectrum to shorter wavelengths in the light coming from objects moving toward the observer.

4.6 billion years