| A | B |
|---|
| wavelength | the distance from any point on a wave to the corresponding point on the next wave |
| electromagnetic spectrum | all of the frequencies or wavelengths of electromagnetic radiation |
| spectrum | a range of electromagnetic radiation that is ordered by wavelength or frequency, such as the band of colors that is produced when white light passes through a prism |
| universe | space and all the matter and energy in it |
| redshift | a shift toward the red end of the spectrum: occurs in the spectrum in an object when the object is moving away from the observer |
| Big Bang Theory | the theory that all matter and energy in the universe was compressed into an extremely small volume that 13 billion to 15 billion years ago exploded and began expanding in all directions |
| cosmic microwave background | the electromagnetic radiation left over from the formation of the universe |
| neutron star | a star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons |
