Question

The most distant galaxies yet observed are at least 10 billion light years away because:

A) they are moving away from us at a high speed
B) they are very faint and difficult to detect
C) light from those galaxies took billions of years to reach us
D) they are located in a region with low light pollution

Answer 1

The most distant galaxies yet observed are at least 10 billion light years away because light from those galaxies took billions of years to reach us.

Step-by-step explanation:

The most distant galaxies yet observed are at least 10 billion light years away because light from those galaxies took billions of years to reach us. The light we receive from these galaxies has been traveling to us for a very long time. When we observe a galaxy that is 10 billion light years away, it means that the light we are seeing now left that galaxy 10 billion years ago.