<span>An observation of the red shift of galaxies suggests that the universe is expanding. The correct option among all the options that are given in the question is the first option or option "a". I hope that this is the answer that you were looking for and it has actually come to your help.</span>
The water molecules with a slower speed are escaping
The uniform microwave radiation remaining from the Big Bang.
So, your body is always having background radiation and that means space!
A= v²/R
a = 12²/30 =4.8 m/s²
