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I recently realized that if we got in Jupiter's gravity well we could probably never escape it again. Someone correct me if I'm wrong. The thought made me fee

I recently realized that if we got in Jupiter's gravity well we could probably never escape it again. Someone correct me if I'm wrong. The thought made me feel really uneasy.

hossbeast 7y ago
If that were true, it would be impossible to leave the solar system, since everything is currently in the Sun's gravity well, and the Sun is larger than Jupiter. But we have sent probes outside the solar system (did they fully leave the Sun's gravity well yet though? Not sure)
- davidivadavid 7y ago
  But we didn't send the probes from the Sun.
  - furyofantares 7y ago
    Plus I don't think it got its velocity from Earth, but by using gravity assists to steal momentum from other planets (which, if you don't know how that works, do yourself a favor and read the wikipedia page, it's pretty great).
- gmoot 7y ago
  Sure, we could orbit Jupiter and get back out. But if we ever descended to the "surface" we couldn't climb back out. Voyager 1/2 and New Horizons are at escape velocity and leaving the solar system.
- lostmsu 7y ago
  You have to have high thrust to get out of the dragging atmosphere.
- sudhirj 7y ago
  The premise is about current chemical propellants and structural components. If you build a rocket out of nanotubes with nuclear propulsion you could go wherever you want from anywhere else. Except black holes.
- mrfusion 7y ago
  Remember that we’re already orbiting the sun though. A lot of the hard work is already done.
bagels 7y ago
Launching from the (nonexistent) surface of Jupiter would be the comparison. From a low orbit of Jupiter you need a lot of delta v to escape, but you don't need extremely high thrust as would be needed to get in to orbit in the first place from the surface of a body. You could use a very efficient thruster over a long period of time which is a lot easier to design for.
tdy721 7y ago
So along this same line the PSP Parker Solar Probe is exploring our gravity well in the other direction, and in some ways will be more gone forever than voyagers. I think the Jovian Moon Io is very low, look up an eclipse photo from Juno; it would be key to exploring low Jovian orbit, just like Venus kicks PSP and Jupiter kicked Voyagers.

I recently realized that if we got in Jupiter's gravity well we could probably never escape it again. Someone correct me if I'm wrong. The thought made me feel really uneasy.

hossbeast 7y ago

If that were true, it would be impossible to leave the solar system, since everything is currently in the Sun's gravity well, and the Sun is larger than Jupiter. But we have sent probes outside the solar system (did they fully leave the Sun's gravity well yet though? Not sure)

davidivadavid 7y ago
But we didn't send the probes from the Sun.
- furyofantares 7y ago
  Plus I don't think it got its velocity from Earth, but by using gravity assists to steal momentum from other planets (which, if you don't know how that works, do yourself a favor and read the wikipedia page, it's pretty great).
gmoot 7y ago
Sure, we could orbit Jupiter and get back out. But if we ever descended to the "surface" we couldn't climb back out. Voyager 1/2 and New Horizons are at escape velocity and leaving the solar system.
lostmsu 7y ago
You have to have high thrust to get out of the dragging atmosphere.
sudhirj 7y ago
The premise is about current chemical propellants and structural components. If you build a rocket out of nanotubes with nuclear propulsion you could go wherever you want from anywhere else. Except black holes.
mrfusion 7y ago
Remember that we’re already orbiting the sun though. A lot of the hard work is already done.

bagels 7y ago

Launching from the (nonexistent) surface of Jupiter would be the comparison. From a low orbit of Jupiter you need a lot of delta v to escape, but you don't need extremely high thrust as would be needed to get in to orbit in the first place from the surface of a body. You could use a very efficient thruster over a long period of time which is a lot easier to design for.

tdy721 7y ago

So along this same line the PSP Parker Solar Probe is exploring our gravity well in the other direction, and in some ways will be more gone forever than voyagers. I think the Jovian Moon Io is very low, look up an eclipse photo from Juno; it would be key to exploring low Jovian orbit, just like Venus kicks PSP and Jupiter kicked Voyagers.