Editing Space exploration (section)

===Jupiter===
{{Main|Exploration of Jupiter}}
[[File:Io Tupan Patera.jpg|thumb|[[Tupan Patera]] on Jupiter's moon Io]]
The exploration of [[Jupiter]] has consisted solely of a number of automated NASA spacecraft visiting the planet since 1973. A large majority of the missions have been "flybys", in which detailed observations are taken without the probe landing or entering orbit; such as in [[Pioneer program|Pioneer]] and [[Voyager program|Voyager]] programs. The ''[[Galileo spacecraft|Galileo]]'' and ''[[Juno spacecraft|Juno]]'' spacecraft are the only spacecraft to have entered the planet's orbit. As Jupiter is believed to have only a relatively small rocky core and no real solid surface, a landing mission is precluded.

Reaching Jupiter from Earth requires a delta-v of 9.2&nbsp;km/s,<ref name="delta-v">{{cite web |last=Wong |first=Al |date=28 May 1998 |url=http://www2.jpl.nasa.gov/galileo/faqnav.html |archive-url=https://web.archive.org/web/19970105184300/http://www.jpl.nasa.gov/galileo/faqnav.html |url-status=dead |archive-date=5 January 1997 |title=Galileo FAQ: Navigation |publisher=NASA |access-date=28 November 2006 }}</ref> which is comparable to the 9.7&nbsp;km/s delta-v needed to reach low Earth orbit.<ref name="pma-delta">{{cite web |last=Hirata |first=Chris |url=http://www.pma.caltech.edu/~chirata/deltav.html |title=Delta-V in the Solar System |publisher=California Institute of Technology |access-date=28 November 2006 |archive-url=https://web.archive.org/web/20060715015836/http://www.pma.caltech.edu/~chirata/deltav.html |archive-date=15 July 2006 }}</ref> Fortunately, [[Gravitational slingshot|gravity assists]] through [[planetary flyby]]s can be used to reduce the energy required at launch to reach Jupiter, albeit at the cost of a significantly longer flight duration.<ref name="delta-v" />

Jupiter has 95 [[Moons of Jupiter|known moons]], many of which have relatively little known information about them.