Question

If a star of which is 100 light years away explodes today comedy and when it will be visible to us ?​

Answer 1

Answer-

We know that,

• Speed of light = 3 × 10⁵ km/s

• Distance of the earth from the star = 100 × 9.5 × 10¹² km

Time taken (t)

= 100 × 9.5 × 10¹² km / 3 × 10⁵ km/s

= 316.67 × 10⁷ s

___________________________

Answer 2

$\huge!{\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}$

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, 100years to reach earth.

Therefore, after 100 years the explosion will be visible to people on earth.

 $\huge\boxed{\fcolorbox{white}{pink}{Hope!it's helps u...xd}}$