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APOD: Jupiter's Europa from Spacecraft Juno (2022 Oct 03)
Posted: Mon Oct 03, 2022 4:08 am
by APOD Robot
Jupiter's Europa from Spacecraft Juno
Explanation: What mysteries might be solved by peering into this crystal ball? In this case, the ball is actually a moon of
Jupiter, the crystals are ice, and the moon is not only dirty but cracked
beyond repair. Nevertheless, speculation is rampant that oceans exist under
Europa's fractured ice-plains that
could support life. Europa, roughly the
size of
Earth's Moon, is
pictured here in an image taken
a few days ago when the Jupiter-orbiting robotic
spacecraft Juno passed within 325 kilometers of its
streaked and
shifting surface. Underground
oceans are thought likely because
Europa undergoes
global flexing due to its changing gravitational attraction with Jupiter during its slightly
elliptical orbit, and this flexing heats the interior. Studying Juno's
close-up images may further humanity's understanding not only of Europa and the
early Solar System but also of the possibility that
life exists elsewhere in the universe.
Re: APOD: Jupiter's Europa from Spacecraft Juno (2022 Oct 03)
Posted: Mon Oct 03, 2022 1:04 pm
by orin stepanek
Aren't there other moons with oceans that might harbor life?
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
Re: APOD: Jupiter's Europa from Spacecraft Juno (2022 Oct 03)
Posted: Mon Oct 03, 2022 8:06 pm
by johnnydeep
Nice! First pic of Europa from Juno! Twenty years after the last close-up from Galileo in 2000. Will Juno be making more passes, or is this the one and only? I read the links, but that didn't seem to be mentioned.
Re: APOD: Jupiter's Europa from Spacecraft Juno (2022 Oct 03)
Posted: Tue Oct 04, 2022 3:48 am
by alter-ego
johnnydeep wrote: ↑Mon Oct 03, 2022 8:06 pm
Nice! First pic of Europa from Juno! Twenty years after the last close-up from Galileo in 2000. Will Juno be making more passes, or is this the one and only? I read the links, but that didn't seem to be mentioned.
Yes, more flybys will happen. In its extended mission now, counting this pass, the planned Jovian moon passes will be Ganymede (2), Europa (3), and Io (11).
Re: APOD: Jupiter's Europa from Spacecraft Juno (2022 Oct 03)
Posted: Tue Oct 04, 2022 11:20 am
by johnnydeep
alter-ego wrote: ↑Tue Oct 04, 2022 3:48 am
johnnydeep wrote: ↑Mon Oct 03, 2022 8:06 pm
Nice! First pic of Europa from Juno! Twenty years after the last close-up from Galileo in 2000. Will Juno be making more passes, or is this the one and only? I read the links, but that didn't seem to be mentioned.
Yes, more flybys will happen. In its extended mission now, counting this pass, the planned Jovian moon passes will be Ganymede (2), Europa (3), and Io (11).
Wonderful!
Re: APOD: Jupiter's Europa from Spacecraft Juno (2022 Oct 03)
Posted: Wed Oct 05, 2022 3:07 am
by VictorBorun
I wonder how can the cracks be skew lines like grade separation.
Are there transparent layers of ice that were being formed and cracked at different stages of history?
Re: APOD: Jupiter's Europa from Spacecraft Juno (2022 Oct 03)
Posted: Thu Oct 06, 2022 12:45 am
by MarkBour
Just an odd set of thoughts here. If Europa has enough energy being imparted to it, then the subsurface water could indeed be liquid. I don't know if it's proper to call that an ocean, but for want of a better term, then, yes, an "encased ocean". Does this make life likely? Since we don't know quite how life formed for our one example, we end up pretty unsure of the likelihood.
My particular thought is that we don't know whether material that came from space was important on Earth to help life get going. If that were true, then Europa being an enclosed environment might lack the opportunity for life to start up there. Or it might make it a lot harder, for a spark to happen.
Re: APOD: Jupiter's Europa from Spacecraft Juno (2022 Oct 03)
Posted: Thu Oct 06, 2022 1:49 am
by Chris Peterson
MarkBour wrote: ↑Thu Oct 06, 2022 12:45 am
Just an odd set of thoughts here. If Europa has enough energy being imparted to it, then the subsurface water could indeed be liquid. I don't know if it's proper to call that an ocean, but for want of a better term, then, yes, an "encased ocean". Does this make life likely? Since we don't know quite how life formed for our one example, we end up pretty unsure of the likelihood.
My particular thought is that we don't know whether material that came from space was important on Earth to help life get going. If that were true, then Europa being an enclosed environment might lack the opportunity for life to start up there. Or it might make it a lot harder, for a spark to happen.
The material that came from space and may have been very important for life to form appears to originate mostly in the outer ice bodies. Europa probably doesn't need to get these things from space... it's a source of them!