Suppose a star which is 100 light years away explodes today.It is highly unlikely that you will be able to see the explosion. Why?

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Solution

A light is the distance that light travels in vacuum in one year $.$ If a star is at a distance of $100$ light years then it would take light $,$ $100$ years to reach earth $.$
Therefore $,$ after $100$ years the explosion will be visible to people on earth $.$

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Suppose a star which is 100 light years away explodes today.It is highly unlikely that you will be able to see the explosion. Why?

A light is the distance that light travels in vacuum in one year. If a star is at a distance of 100 light years then it would take light, 100 years to reach earth.Therefore, after 100 years the explosion will be visible to people on earth.

A light is the distance that light travels in vacuum in one year $.$ If a star is at a distance of $100$ light years then it would take light $,$ $100$ years to reach earth $.$
Therefore $,$ after $100$ years the explosion will be visible to people on earth $.$