Red shift

• Redshift

  The phenomenon where the light from distant galaxies appears shifted towards the red end of the spectrum
• Big Bang


  The theory that the universe began in a tiny, extremely dense and hot state, and has been expanding and cooling ever since
• From Earth, every direction we look into space, the galaxies seem to be moving further and further away from us, or in other words, the universe is expanding
• Absorption spectrum

  The pattern of dark lines in the spectrum of visible light emitted from the sun, caused by certain wavelengths being absorbed by chemicals in the sun's atmosphere
• Light from distant galaxies

  Appears shifted towards the red end of the spectrum (redshift)
• The further away a galaxy is, the faster it appears to be moving away from us
• Models are not perfect, but they help us understand difficult concepts