Planets

Juno Is One Month From Jupiter: Photos

<p>Credit: NASA/JPL/UH/NIR<span></span></p>

NASA's Juno mission is now only one month from reaching Jupiter and recently crossed the boundary where Jupiter's gravity now has more influence than the sun. Next, the spacecraft will journey to the king of planets, insert itself in orbit on July 4 and get its instruments ready to start an 18-month observing campaign kicking off in November.

What are some of the questions it will try to answer? Browse this slide show to find out:

Jupiter's water abundance is expected to show astronomers how it was formed, and by extension, the story of water in the solar system. Scientists are eager to use the mission to peer inside of Jupiter and to see how much water is inside. It is already known that the water in the stratosphere mostly comes from the Shoemaker-Levy 9 impact of 1995, but deeper down the water abundance is unknown.

Image: Artist's impression of the young solar system Beta Pictoris. Credit: NASA

Most observations of Jupiter's weather are done by amateurs, who can talk about bands changing color, the size of the Great Red Spot shrinking, and other phenomena on the solar system's larger planet. Juno will be able to probe beneath the surface, however, to see what is happening underneath. It is poorly understood how deep weather features go on the giant planet, so Juno will give astronomers a better glimpse.

Image: Jupiter's cloud belts are known to change shape, disappear and reappear, as seen in this 2010 image composite of the planet. By observing in three different wavelengths, astronomers were able to spot the south equatorial band of Jupiter reappearing by looking beneath cloudtops. Credit: NASA/JPL/UH/NIR

Image: Jupiter's immense gravity influences several dozen moons, such as those shown here in this artist's impression. Credit: NASA/JPL

It's not known what kind of core Jupiter has (if it has any core at all), which is interesting because the planet has such an intense magnetic environment. On Earth, the core's rotation is believed to create the magnetic field; this means that Jupiter's precise magnetic generation is somewhat unknown. Scientists hope to learn more about the interior of Jupiter by examining its magnetic and gravity fields.

Image: An X-ray aurora at Jupiter seen by the Chandra X-ray Observatory in 2011, and put on a simultaneous optical image taken by the Hubble Space Telescope. Credit: X-ray: NASA/CXC/SwRI/R.Gladstone et al.; Optical: NASA/ESA/Hubble Heritage (AURA/STScI)

Jupiter has a really intense magnetic field that generates huge auroras on the planet. Scientists hope to get a better sense about how the magnetosphere (the entire magnetic environment) behaves, such as the interactions with the solar wind and with Jupiter's moons.

Image: Artist's conception of a hot Jupiter, meaning a Jupiter-sized planet that is close to its parent star. Credit: NASA/Ames/JPL-Caltech

Jupiter is often considered an analog for exoplanets, but how closely it resembles them is something we are still learning about. It is hoped that by probing Jupiter's insides with Juno, that we can create models about how our own solar system formed. Presumably this could extend to other solar systems, depending on what we find and how relevant the information is.