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A comment on Earth-like planet spotted orbiting Sun’s closest star. Parent comment

Re:Earth-like planet spotted orbiting Sun’s closest star by withinboredom on Friday February 11, 2022 @07:05AM (#30300416)
IIRC, the limit with humans on-board is like .3c due to the red/blue shifting of the background radiation of the universe. At about .3c, it turns into microwaves/radar/x-rays and such, becoming quite bad for humans. There’s so much background radiation, there may be no way to adequately shield from it and/or travel may be limited only in the direction of less background radiation.

Maybe someone has a link to more information, that’s just what I remember from years ago.

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Re:Earth-like planet spotted orbiting Sun’s closest star by ffhhj on Friday February 11, 2022 @08:52AM (#30301472)
Right, also the hull must resist the impact against hidrogen atoms at near the speed of light, which would apply tremendous forces. Dust will be like exploding nukes.
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Re:Earth-like planet spotted orbiting Sun’s closest star by Udo on Friday February 11, 2022 @07:09AM (#30300449)
That's a good point. I have no idea actually where the practical limits would be, especially considering options that arise if the ship has access to a lot of electrical power to generate a protective magnetic field. But even at 0.3c, the trip to Proxima could still be worthwhile for an unmodified human.
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Re:Earth-like planet spotted orbiting Sun’s closest star by anders_p on Friday February 11, 2022 @09:05AM (#30301611)
You still have the deceleration issue.

You need to use the same amount of energy and time to decelerate, as you did to accelerate.

So you'd only be able to sustain constant acceleration for half the distance. Then deceleration for the second half of the journey.

That would make the travel time much, much longer than your calculations, since you'd be traveling at relatively slow speed for both the first & last 20-25% of the distance.

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Re:Earth-like planet spotted orbiting Sun’s closest star by IHLayman on Friday February 11, 2022 @08:44AM (#30301377)
Here’s a link to a Gizmodo article talking about the study… unfortunately I can’t get the original study to load: https://gizmodo.com/this-is-what-it-would-really-look-like-t...
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