# Mars in 39 Days? How about THREE Days?

Discussion in 'Science and Technology' started by JimBowie1958, Apr 22, 2012.

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### JimBowie1958Old Fogey

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If one has a ship made of graphene, plasma jet engines and powered by any of the new nuclear fusion power generators in development (which requires practically 0 weight in fuel compared to the ships total weight) we could have a trip to Mars at its farthest distance completed in (4 * SQRT (2.5/1)) = 6.3 days, and in 2.8 days at its closest distance to Earth.

Pluto could be reachedin a range of 22 to 29 days.

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Discussion of acceleration/deceleration travel at 1g acceleration:
Interplanetary travel at 1g acceleration [Archive] - Straight Dope Message Board

Formula for calculating travel time in days:
4 * SQRT (A/G)
A = astronomical units of distance
G = #gs acceleration

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### ScienceRocksDemocrat all the way!

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When this day occurs a city on mars will be possible! I doubt I will live to see the day this occurs.

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### Mr. H.Diamond Member

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### JimBowie1958Old Fogey

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OK, now consider interstellar flight.

AU = 92,955,807 mi

1 LY = 6,000,000,000,000 mi

1 LY = 64,546 AU

Plugging these numbers into the above formula at 1G acceleration, it takes 1,016 days to go 1 light year.

Alpha Centari is 4.37 LY from Earth, or 282,000 AU and would take 2,124 days or 5.8 years at 1G acceleration/deceleration to get there.

Siriusis 8.58 LY from Earth, or 553,000 AU and would take 2,976days or 8.1 years at 1G acceleration/deceleration to get there.

We are on the cusp of potentially having interstellar flight. Scooting safely by the Oort Cloud or the Asteroid Belt is merely a matter of engineering and navication.

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### WiddekindMember

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in my estimation, "terra-forming" over-sized asteroids -- big enough to gravitate, so we call them "planets" -- will never be worthwhile. (As an aside, please ponder the costs -- then realize, that de facto, that much Money-value has already been "invested" in our earth, which is why our "home base" has huge unrecognized FMV.)

instead, (mobile) space habitats, equipped with artificial gravity ("they'll rotate"), EM shielding ("magnetic fields"), etc. will be far more efficient, economical, practical. For example, when you try to live on an "over-sized asteroid", often the rock "shifts around" (earthquakes), or heats up & vents (volcanoes) -- on the space-shuttle, or ISS, those are called "system failures", and are destructive & costly. Artificial space-habitats could be built (e.g. O'Neill cylinders) which would never (themselves) undergo such disasters ("no hurricanes in space").

i estimate, that "terra-forming" will never be cost-effective; if-and-when humans can exploit space profitably, humans will live in "Battlestar Galactica / Noah's Space-Arks".

for a profitable "short term", development & deployment, of orbital farms ("it's always sunny in space") could grow arbitrary tonnages of crops, under controllable conditions, without storms & pests; and would be a big first step, towards generating artificial, self-sustaining, space-habitats

Last edited: Apr 26, 2012
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### waltkyWise ol' monkeySupporting Member

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Uncle Ferd says its a sign fer space aliens to invade earth...

Student researcher spies odd lava spirals on Mars
26 Apr.`12  A researcher has spotted lava flows shaped like coils of rope near the equator of Mars, the first time such geologic features have been discovered outside of Earth.

UFO Spaceship Orbiting the Sun, or a Camera Glitch?
UFO hunters have spotted a curious object near the sun in a new NASA image. It is, in the words of a blogger for the website Gather, "what looks like a metallic, jointed spaceship with a gigantic extension, perhaps a boom arm, anchored off its lower end." The YouTube video drawing attention to the object has quickly made its way to discussion forums and the tabloid press, and many seasoned UFO believers are calling it a definite "spot."

Last edited: Apr 26, 2012
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### uscitizenSenior Member

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Actually Mars is a lunchtime roundtrip for me.

Did y'all forget about deceleration time?

Last edited: Apr 26, 2012
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### zzzzJust a regular American

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Actually with LSD you can do the trip in under an hour.

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### jmastersonRookie

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This beats the one way trips I saw proposed by someone in the news a few months ago. The idea is to send old people to mars with no plan to bring them home. They would work to prepare a settlement for future trips to mars and live out the remainder of their lives on Mars. It was a serious proposal.

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### davemanDiamond Member

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8.1 years ship's time. Back here on earth, decades would go by. Lots of good science fiction been written about time dilation.

By the way, after 4 years of acceleration at 1 G, you've reached well over 90% of the speed of light. Explanation and math here: How long would it take to accelerate a person to the speed of light without dying? [Archive] - Straight Dope Message Board

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