Timeline for What is the most energy efficient mode of travel by a land animal on a terrestrial planet with 0.1g at surface?
Current License: CC BY-SA 4.0
18 events
| when toggle format | what | by | license | comment | |
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| Jan 24, 2021 at 10:19 | comment | added | user81881 | I’m finding it difficult to see how such a planet can exist. If a planet had the same diameter as Earth & only 0.1 the mass of Earth, the value of g would 0.1, but the average density would be 0.5513 g/cm3, which is very similar to the density of the rubble pile asteroid is 67P/Churyumov–Gerasimenko which has a mean density of 0.533 g/cm3. Other rubble pile asteroids 162173 Ryugu & 101955 Bennu each have a mean density of 1.19 g/cm3. The gravity on Earth’s moon is 0.1666 g & it has no atmosphere. | |
| Jan 24, 2021 at 8:02 | comment | added | PcMan | The criteria of " Air time should not be longer than 10% of the time when making the journey." is utterly unrealistic. Even humans at a slow jog, spend more time than this airborne. An Olympic sprinter spends less than 5% of time in contact with the ground. | |
| Jan 24, 2021 at 7:10 | answer | added | TysonDennis | timeline score: 0 | |
| Jun 28, 2020 at 23:38 | vote | accept | user6760 | ||
| Jun 28, 2020 at 22:06 | answer | added | Logan R. Kearsley | timeline score: 0 | |
| Jun 28, 2020 at 21:50 | comment | added | Rodolfo Penteado | @lijat Atmosphere depend of the body are able to hold the gases. Each gas have some speed in given temperature. Once this speed is bigger than the that to escape of gravitational well, the gases will escape. Titan (0,138g) hold their atmosphere because is cold. Same to Pluto (0,063g). | |
| Jun 28, 2020 at 21:40 | comment | added | lijat | @Rodolfo Penteado as a counter example, look at Titan. Atmosphere is not a function of gravity. | |
| Jun 28, 2020 at 20:58 | answer | added | M. A. Golding | timeline score: 0 | |
| Jun 28, 2020 at 17:07 | comment | added | Rodolfo Penteado | How tin is the atmosphere of a world with only 10% of Earth gravity? Look the challenge to NASA build a helicopter to fly in Mars as example. Fly is totally not a option. | |
| Jun 28, 2020 at 16:15 | answer | added | Franklin Pezzuti Dyer | timeline score: 7 | |
| Jun 28, 2020 at 14:48 | comment | added | Akita | Edit : somebody did.... | |
| Jun 28, 2020 at 14:47 | comment | added | Akita | Kangourou-style hoping is known to be a super efficient way of traveling. With less gravity and longer hops, even more so. I would've written about it without your last sentence. | |
| Jun 28, 2020 at 14:34 | answer | added | Slarty | timeline score: 1 | |
| Jun 28, 2020 at 12:26 | comment | added | ProjectApex | You know that running for many animals is basically about getting as close to flying as possible, right? Digitigrade creatures (usually more adapted for running) evolve to minimize the contact with the ground, maximize the force pointing backwards they exert and usually extending the gait length. Your hare might as well have evolved into a mole that eventually jumps out of its holes, if it will spend almost no time in the air in a planet with a less dense atmosphere . | |
| Jun 28, 2020 at 10:49 | comment | added | Plutian | "Air time should not be longer than 10% of the time" this is a restriction which severely constricts your options, and doesn't really make sense of an efficiency point of view. A hare's gait, or most animals gaits for longer distance runs (even humans) has an air time of much more than 10% on average. Especially when the gravity restriction verses the upper limits of muscle strength is so different, you'd expect a creature to spent more time in the air, not less. This is because air resistance is much lower than contact with the ground, so you'd want to minimise your contact points. | |
| Jun 28, 2020 at 6:27 | answer | added | Mr. Anderson | timeline score: 1 | |
| Jun 28, 2020 at 6:13 | history | edited | The Square-Cube Law | CC BY-SA 4.0 |
deleted 2 characters in body
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| Jun 28, 2020 at 5:42 | history | asked | user6760 | CC BY-SA 4.0 |