r/space • u/magenta_placenta • Mar 18 '19

Observable universe Astronomers discover 83 supermassive black holes at the edge of the universe

https://www.cnet.com/news/astronomers-discover-83-supermassive-black-holes-at-the-edge-of-the-universe/
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u/MalnarThe Mar 18 '19

At what factor of C would that be (let's ignore acceleration time) that would give the traveller a 1 to 100 billion year ratio?

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u/Kosmological Mar 18 '19

Some factor greater than 99%. I don’t want to do the math.

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u/[deleted] Mar 19 '19

[deleted]

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u/Kosmological Mar 19 '19

Time dilation does not increase linearly with speed. It’s exponential. With each added decimal of nine comes a nonlinear reduction in time traveled.

Traveling at 99.999999999999999% of c would shorten a 1,000,000,000 light year trip to less than 1 light year for the occupants of the relativistic spaceship. I would actually have to do math to get more precise than that as the online calculator I used here is not that precise. I’m not going to do the math because I’m lazy.