Electromagnetic radiation emitted by distant galaxies appears redshifted when it is detected on Earth. This provides evidence for the Big Bang Theory. Which statement is correct?
- ALight from galaxies that are moving towards the Earth is redshifted.
- BRedshift is an increase in the wavelength of electromagnetic radiation.
- CThe Big Bang Theory says that the Solar System is expanding out into the Universe.
- DThe Big Bang Theory says that, billions of years ago, the Universe expanded to its current size in a few seconds.