How do light years astronomers to determine the ages of distant objects in space ?

hello!

your answer

Light in space travels approximately 9.5 trillion km per year. Therefore, the images that astronomers see of distant objects actually show what those objects looked like long ago.

have goed day

i tried the eyeshadow trick you told me about and it worked so good i i did a yellow going into orange colors and it was bright and you could see it on my eyes