Light travels at 186,000 miles per second. If this star is 54 billion light years away, how long ago did it actually get blowed up?
5,865,696,000,000
X54,000,000,000
Calculator doesn’t go that high. I tried;-)
Answer: 54 billion years.
Sneaky! The old trick question with superfluous information. But you were caught!
Not 54 but only (ha, ha) one billion light years away. So this happened one billion years ago.
How far can light travel in one year?
Approximately 5,878,499,817,000 miles. That’s almost 6 trillion miles.
And it took this explosion a billion years to reach us.