What is the underwater temperature of Europa?

I know Jupiter emits infrared light but does it emit any light able to support plant life of any type on near by Moons? Can under water volcanic activity of Europa produce enough light to support plant life?

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  • $\begingroup$ Jupiter doesn't emit visible light. It does emit thermal radiation and radio waves, but plants don't use that. $\endgroup$ – David Hammen Nov 28 '18 at 15:55
  • $\begingroup$ The question seems flawed. Earth doesn't emit enough light to grow plants, it receives an abundance of light from the Sun. Jupiter receives much less and it also has a thick, constant cloud cover and no surface on which for plants to grow. $\endgroup$ – userLTK Nov 28 '18 at 16:40
  • $\begingroup$ Your edit seems to be bringing the question closer to your other one. Europa receives some light from the Sun, but that light doesn't penetrate it's icy crust, so Europa's oceans are dark. You won't find any plants in the sense that we think of them on Jupiter or Europa. astronomy.stackexchange.com/questions/28503/… $\endgroup$ – userLTK Nov 28 '18 at 16:42
  • $\begingroup$ @userLTK is this better? $\endgroup$ – Muze Nov 28 '18 at 16:45
  • $\begingroup$ @userLTK Jupiter emits far more energy than it receives from the Sun. $\endgroup$ – Rob Jeffries Nov 28 '18 at 17:46

The surface of Europa gets some sunlight direct from the sun and some long wave radiation from Jupiter so it's not in darkness. It's also in Jupiter's radiation belt so it gets hit with high energy charged particles and the surface of Europa, despite being bombarded by particles is still a vacuum. The surface of Europa is a terrible place to look for life, with the exception being that the liquid ocean of Europa explodes onto it's surface regularly, so evidence of life, if it exists, may well be found on the surface, but it's unlikely that anything can live there for long. It's very inhospitable.

The inside of Europa is more interesting. That's why Neil deGrass Tyson says he wants to go "ice fishing on Europa" to see what "licks the camera" and if we find life there we'll "Call them Europeans" . . . funny comments aside, the inside of Europa is probably dark, outside of some infra-red rays due to temperature. Photosynthesis doesn't work well in darkness and with just long wave light, though maybe it's possible, it wouldn't nearly as much growth due to far lower energy levels.

As noted in the answer to your other question, if there is life in Europa's ocean, it's more likely to be something like chemotrophs.

What makes Europa interesting is the energy it gets from tidal forces being stretched between Jupiter and Ganymede, so it gets a regular influx of heat and perhaps internal volcanism, so it may have undersea vents similar to our oceans. The energy influx and possibility of underwater volcanoes makes it more interesting than most other moons or dwarf planets.

If life is found in Europa's oceans, even if it's very primitive life by most standards, it would still be a very cool discovery because it could tell us something about how life starts and that's a big unknown right now. The discovery of life outside the Earth would be a very big story.

We'll probably have to wait till 2030 before we begin to get some answers. Sorry for the long wait, but it is what it is.


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