Redshifts

1. galaxies that are moving closer together
2. galaxies that are moving farther apart
3.galaxies that are growing in size
4.galaxies that are shrinking

Redshifts are galaxies that are moving farther apart.

Explanation :

Redshifts are the phenomenon in physics in which light gets shifted towards longer wavelength. The relation between energy and the wavelength is inverse. So, it can be also defined as the phenomenon in which the light gets shifted towards shorter energy range.

Blueshift is again a process but it is the opposite of redshift. In the blueshift, the light shifts towards the smaller wavelength.

The main cause of redshift is that the universe is expanding and the objects move away from each other.

Hence, the correct option is (2) " galaxies that are moving farther apart ".

mistakes are ok

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2