# Accelerating a mass of 1000 tons to C.

**URL:** <https://boards.straightdope.com/t/accelerating-a-mass-of-1000-tons-to-c/427832>\
**Category:** Factual Questions\
**Created:** [November 26, 2007, 8:23pm UTC](https://boards.straightdope.com/t/accelerating-a-mass-of-1000-tons-to-c/427832 "2007-11-26T20:23:23Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![Shalmanese](https://avatars.discourse-cdn.com/v4/letter/s/45deac/32.png) [@Shalmanese](https://boards.straightdope.com/u/Shalmanese)\
**Post date:** [November 28, 2007, 8:36am UTC](https://boards.straightdope.com/t/accelerating-a-mass-of-1000-tons-to-c/427832/21 "2007-11-28T08:36:45Z")

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It takes a LOT of energy to get something anywhere close to C. I can’t remember the exact numbers but I recall it would take 99 kg of antimatter to accelerate 1kg of matter up to 0.5 C and then stop it again. Nearly every sci-fi novel vastly underestimates the mundane logistics of interstellar travel. It may turn out to be feasible but not economically viable for anything but long term hibernation ships.

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**Author:** ![NoCoolUserName](https://avatars.discourse-cdn.com/v4/letter/n/5fc32e/32.png) [@NoCoolUserName](https://boards.straightdope.com/u/NoCoolUserName)\
**Post date:** [November 28, 2007, 6:57pm UTC](https://boards.straightdope.com/t/accelerating-a-mass-of-1000-tons-to-c/427832/22 "2007-11-28T18:57:32Z")

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[QUOTE=Epimetheus]  
How will 2Gs make you older? Just the forces involved?  
[/QUOTE]  
Wear and tear.

Conversely, if you accelerate at 1/2 G, you’ll be younger when you arrive. 🙂

If you pass the speed of light, you arrive before you left, which makes you temporally younger as well.

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