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I think it's a fun question, if impossible. The only way to turn Jupiter into a star that's even remotely practical is to add to it's mass. Ignoring brown dwarfs that are very limited in energy output, to get a red dwarf going, you'd need to add at least 75-80 or so Jupiter masses. (a bit more than 24,000 earth masses). You'd want to add a fair ...


Well, if "last night" means around 2015-04-22 at 2230 GMT, the order from left to right is: Europa, Io, Ganymede, Callisto. Here is a stellarium snapshot of (roughly) this configuration. The snapshot doesn't label the moons, but I clicked on each individually to confirm the order above.


As mentioned previously, to be certain you need to record the day and time of the picture and compare to a program or table of moon positions. Short of doing that, the far right & left ones appear to be the smaller moons (IO & Europa) while the middle two appear to be Callisto & Ganymede (I base this upon apparent size of the moons). If you ...


In-the-Sky.org has a dedicated calendar for the Galilean moons. I can't seem to reconcile your picture with the plot for the last day or two, though!


Use an orrery that will let you specify a specific epoch and vantage point. There are some quite fancy ones online, for example this Solar System Scope: What you do in this particular tool is click on the calendar bar below and enter date and time of your observation (if you forgot that, there's a good chance your photograph has a time stamp, either of ...


The easiest way is to look it up, e.g. here: http://www.skyandtelescope.com/observing/a-jupiter-almanac/ Because the moons' positions change, and they are too small to distinguish in a small telescope, there are no general rules.

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