Light from distant galaxies arrives stretched, shifted toward the red. The further the galaxy, the bigger the stretch, telling us that everything is rushing apart, and hinting that it all began, long ago, from a single point.
Light from distant galaxies is redshifted, stretched to longer wavelengths, showing the galaxies are moving away from us, with more distant ones receding faster. This expansion supports the Big Bang Theory, that the universe began from a tiny point and has been expanding ever since.
Redshift is the increase in the wavelength of light from distant galaxies, showing they are moving away from us. More distant galaxies recede faster.
This supports the Big Bang Theory, that the universe began from a single point and has been expanding ever since.
See light from receding galaxies shifted toward the red, more so for the most distant.
Four quick checks. Each correct answer earns XP and lights this skill on your star map.
Redshift means the wavelength of light from a galaxy is...
Redshift of a galaxy shows that it is...
More distant galaxies are moving away...
The expansion of the universe supports the...
Receding galaxies mean an expanding universe, which points back to a Big Bang.
Redshift means the light’s wavelength is increased, stretched, which shows distant galaxies are moving away from us. The further away a galaxy is, the faster it recedes, which is the evidence that the universe is expanding.
Unlocks once the four checks above are done. Worth more XP, written in the style of Paper 2.
Light from a distant galaxy is found to be redshifted. This shows the galaxy is...
That more distant galaxies show greater redshift tells us that...
The Big Bang Theory states that the universe...
Redshift and the Big Bang are mapped. Keep the chain going.