Scenario: Imagine that you are observing the light from a distant star that was

Question

Scenario: Imagine that you are observing the light from a distant star that was located in a galaxy 100 million ly (light years) away from you. The image that you see from that light is of a 10-million-year-old star. You recognize the particular type of star, and know that such stars have a total lifetime of 50 million years, at which point they explode in a catastrophic supernova.

Piece together a timeline for the sequence of events described in the problem, with time (t) = 0 million years representing the moment the star is actually born. Subsequent times are all referenced to t=0. Hint: One time is used twice; four are used once each, and four are used not at all.

Note: The events are listed in random order in the left column, and not chronological order.

star appears to be born, to observer on Earth Choose ] t 160 million years t 110 million years t-0 million years t-60 million years t-100 million years t 40 million years t 50 million years t-150 million years t 10 million years star appears to be 50 million year old, to observer on Earth star appears to go supernova, to observer on Earth star appears to be 10 million years old, to observer on Earth [ Choose ] star is actually born Choose ] supernova actually occurs Choose]

Explanation / Answer

1. Star appears to be born at 10 million years. As at time t=0 the observer on the earth sees no image.when t=10 the observer on the earth sees the image of the new born star

2.Star appear to be 60 million years since at t=0 image is seen at t=0. image of the star is seen so at t=50 years t=60 will be seen by the observer.

3.Star attains supernova at age 50 million year but to the observer who is observing 10years older image will see the supernova at 60 million years.

4.t=20

5.at t=0 the star was born

6.supernova actually occurs at t=50 million years

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