Light Years and Observing Cosmic Time — NEET Biology
📚 Practice ConceptWhen we look at stars on a clear night sky we are, in a way, looking back in time. Stellar distances are measured in light years. What we see today is an object whose emitted light started its journey millions of year back and from trillions of kilometres away and reaching our eyes now. However, when we see objects in our immediate surroundings we see them instantly and hence in the present time. Therefore, when we see stars we apparently are peeping into the past.
Assertion (A): Light from distant objects takes time to reach us, affecting our perception of time. Reason (R): When we see stars we apparently are peeping into the past, unlike nearby objects which we see instantly.
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