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The strength of the gravitational field of the body also plays a role: too weak a gravitational field rules out walking, in the sense of taking strides. We know what walking was like on the Moon. It was funny-looking, but definitely walking. Our Moon is composed mostly of rock, while all the other moons are primarily ices, and therefore much less We S 4 Prez - Solar System - Walk On The Wild Side . With a weaker gravity, walking would be even stranger, and slower, but at some point, nothing like steps could happen.
Where to draw the line? The surface gravity of a body depends on both its mass and on its radius: it is proportional to the mass divided by the square of the radius. Thus, a smaller body of denser material may have a higher surface gravity than one of lighter material. Some medium-sized moons may be border cases though. The Moon Let Your Daddy Ride - John Lee Hooker - Blues Greats Vol.
1 a good, sturdy romp with a low-tech pressure suit, just one heavenly body away. But it has been done. Mercury is a possibility, at least at night — but not advised. Most sun worshipers prefer their deity at a greater distance. Venus requires more than a space suit as we know them — pressure too great, far too hot, sulfuric acid etc. The survival equipment required would preclude a walk, as we know it.
Mars is convenient, and the best extraterrestrial walking with a conventional space suit. Moreover, Mars boasts almost as much dry land as Earth. Other attractions: An atmosphere that provides some protection from radiation and smaller meteorites. Seasonal great views of the Earth and Jupiter.
It can be a little chilly even in daytime in Summer, and the dust can pose difficulties, though. Another asteroid, 16 Psycheis the densest asteroid known, and although it's much smaller than Ceres, has a similar surface gravity. Pluto presents a real get-away, for those who like a brisk, nippy walk.
Jupiter has four big moons. Any of these affords either a great view of the big planet, or none at all, depending on which side of the moon you walk. Gravity-wise, they are walkable. But there are other concerns. Io has many volcanos that are constantly erupting, throwing material far into space, which mostly falls back to the surface—not slowed by an atmosphere.
This is an immediately lethal environment. Not a great bet for a walk. The temperature would be nippish…. Brazil - Billy Vaughn And His Orchestra - La Palomathe largest moon of Saturn, is a very interesting place, as well as a walkability question.
Instead of a pressure suit, a suit to support the atmospheric pressure is needed. Titan also has liquid methane rain, and maybe other surprises. Curiously, the moon Tethyswhich twice as big, has surface gravity only slightly more than this — evidently is it composed mostly of ices.
Maybe barely — Mlady - Sly & The Family Stone - Greatest Hits very slowly — but not a great bet, and certainly not effective exercise. This is a very odd moon orbiting an odd planet. We have pictures only of one side of it, from a single quick fly-by of a Voyager spacecraft, but that photo We S 4 Prez - Solar System - Walk On The Wild Side lots of interesting terrain, including volcanos.
You might also consider the medium-sized moons of Saturn DioneRheaIapetus and the larger moons of Uranus TitaniaUmbrielArielOberonfarther Sovereign - Dystopia - Decay the beaten path.
It was mentioned above that Mars has almost as much dry land as does the Earth. Altogether, the dry, walkable surfaces of the Solar System comprises several times that of Earth. In fact, more than the total surface of the Earth, dry or not. The illustrating author of xkcd hit on a similar idea in Surface AreaSpace without the space.
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