How to see back in time?

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I don't mean you can see yourself as you were 5 years back. NO. But you can see the past of celestial objects.

Distance in the cosmos is calculated in light years. Light year is the distance travelled by light in 1 year. 1 light year = 2,99,792.458(speed of light) × 60(per minute) × 60(per hour) × 24(per day) × 365(per year).

So 1 light year = 9.45425496 × 10^12 km.

When you see something 1 light year far, you are actually seeing it as it was 1 year ago ! Since light from there had travelled 1 year to reach you !

If you have a telescope to see 14 billion light years far, you can seeing things as they were, sometime soon after the origin of the universe !
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