The countdown for the Juno spacecraft to reach its destination at Jupiter is now a matter of hours. If there is not, then Jupiter formed out of a collapse of a gas cloud, much as the sun did. Inside Jupiter, hydrogen is believed to undergo another transformation, to a metal. The Search for WaterIt might seem odd to care about the water on Jupiter, but it is one of the main issues that Juno scientists are focusing on. If Juno finds a lot of water, that suggests Jupiter formed farther from the sun in the colder, icier regions and later migrated to its current orbit.

Source: New York Times July 04, 2016 14:28 UTC