Comment on HD 137010 b

ExLisper@lemmy.curiana.net ⁨8⁩ ⁨hours⁩ ago

• m0darn@lemmy.ca ⁨54⁩ ⁨minutes⁩ ago

  What about accelerating 1g for 16 hours of ‘day’, then 8 hours of 3g ‘night’. It would be one hell of a weighted blanket lol.

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• Thorry@feddit.org ⁨6⁩ ⁨hours⁩ ago

  Oh only a billion tons of anti-matter. Good thing we’ve already made a few nanograms, so in a billion years or so we’ll have plenty.

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  • Hotzilla@sopuli.xyz ⁨1⁩ ⁨hour⁩ ago

    Yeah, and antimatter converts to pure energy with e=mc^2 what means that 60 grams contains like Hiroshima worth of energy

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• SubArcticTundra@lemmy.ml ⁨7⁩ ⁨hours⁩ ago

  50% chance of being in the habitable zone

  Imagine sitting on a spaceship for 151 years just to discover your parents’ bet was wrong

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  • Zolidus@lemmy.world ⁨5⁩ ⁨hours⁩ ago

    9.974 years

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  • ExLisper@lemmy.curiana.net ⁨4⁩ ⁨hours⁩ ago

    It’s only 9 years for you!

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    • SubArcticTundra@lemmy.ml ⁨2⁩ ⁨hours⁩ ago

      Ohhhhhhh, ok that’s clever!

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• Valmond@lemmy.dbzer0.com ⁨8⁩ ⁨hours⁩ ago

  How can it take 151 years to go 150 light years when not close to lightspeed most of the time? I get the 9 year thing, but 151 years seems wrong.

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  • ExLisper@lemmy.curiana.net ⁨8⁩ ⁨hours⁩ ago

    Smarter people than me on the internet calculate that at constant 1g you only need 2.5 years to get very close to speed of light. So I guess you accelerate fast enough and reach ‘almost speed of light’ very early in your travel and total time is almost as if you traveled at speed of light the whole time.

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    • Tiresia@slrpnk.net ⁨1⁩ ⁨hour⁩ ago

      The main advantage of keeping accelerating when you’re at >90% of the speed of light is that it means you arrive faster in subjective time. You could take 160 years to get there and use ten times less fuel (or thereabouts), but the subjective travel time would go up by decades.

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    • trolololol@lemmy.world ⁨4⁩ ⁨hours⁩ ago

      Not that smarter when they forget you’re running out of gas by the Oort cloud. Gotta spread christianism capitalism there and build a petrol station before we go further.

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    • Grandwolf319@sh.itjust.works ⁨4⁩ ⁨hours⁩ ago

      Earth’s gravity being what it is a blessing cause it means we can do interstellar travel faster.

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  • Grail@multiverse.soulism.net ⁨8⁩ ⁨hours⁩ ago

    The closer you get to lightspeed, the slower you accelerate (from an outside perspective). It’s actually close to lightspeed for most of the time.

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  • domdanial@reddthat.com ⁨8⁩ ⁨hours⁩ ago

    I just used the calc, it’s closer to 152 years. Which I assume means acceleration at 1g for about a year to reach .999c, and deceleration for the same time.

    I just confirmed with dV= a*t, a year of 1g(9.8m/s/s) gets you just over the speed of light. I think it’s more complicated than that, If I remember right relativistic speeds require more and more energy to accelerate so you can’t ever “reach” light speed.

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  • degenerate_neutron_matter@fedia.io ⁨8⁩ ⁨hours⁩ ago

    Most of the journey is spent traveling very close to light speed. It's not a linear ramping up and ramping down of speed, since it takes more energy to accelerate the closer you get to light speed. Rather you quickly accelerate to near light speed and spend most of the trip working on that last small bit of velocity.

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  • skulblaka@sh.itjust.works ⁨8⁩ ⁨hours⁩ ago

    Constant acceleration at 9.8m/s^2 in a given direction will bring you close to the speed of light eventually, but yeah, I’m also not super sure how this math checks out

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• AngryCommieKender@lemmy.world ⁨5⁩ ⁨hours⁩ ago

  So a bit quicker than terraforming Venus by chucking several oceans worth of ice at it, and some cyanobactera once it cools down in a few hundred thousand years.

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• Grandwolf319@sh.itjust.works ⁨4⁩ ⁨hours⁩ ago

  I’m guessing you probably go faster than 0.9C after six months, given that the difference is 1 year.

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• SpaceNoodle@lemmy.world ⁨8⁩ ⁨hours⁩ ago

  Time for Bussard o invent those collectors

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• Venat0r@lemmy.world ⁨7⁩ ⁨hours⁩ ago

  And you’ll only need 315.3 million GWh per ~80kg person… plus 3.941 million GWh per kg of supplies, equipment and ship weight…

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  • trolololol@lemmy.world ⁨4⁩ ⁨hours⁩ ago

    Great Scott!

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  • Venator@lemmy.nz ⁨3⁩ ⁨hours⁩ ago

    Oh and also thats just the pure energy for acceleration/deceleration, not life support, steering, thrust ineffeciencies etc… 😅

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• ColeSloth@discuss.tchncs.de ⁨7⁩ ⁨hours⁩ ago

  Your statement makes things sound a bit confusing.

  To clarify, if you are inside the ship, 152 years will pass.

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  • FUCKING_CUNO@lemmy.dbzer0.com ⁨6⁩ ⁨hours⁩ ago

    No, the people in the ship will experience less time then 152 years. Relativity tells us the faster an observer is moving, the slower it moves through time.

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