Light from distant galaxies arrives stretched: its wavelength is shifted toward the red end of the spectrum. The further away a galaxy is, the faster it is moving away from us, and the bigger this redshift. That is the evidence that the whole universe is expanding. Move a galaxy out and watch its light shift.
MissionPlace a galaxy with redshift level 7.Round 1Streak 0Best 0
Compared with the target redshift, yours is:
The galaxies drift apart. Predict, set the distance, then check.
distance3
speed moving awayslow
redshiftsmall
Further away means faster recession and a bigger redshift. This is evidence the universe is expanding.