Question

Some of the stars you see in the night sky are already gone. Why is it possible to still see their light?

Answer 1

they are light years away

Step-by-step explanation:

when you look at the sky you are looking at about 6 million years in the past because time travels differently between space and our atmosphere. That's why astronauts can feel like they have been gone for 3 days but really for 3 months.

Key point:

Light travels differently between space and Earth