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== Views to and from Amalthea == {{see also|Extraterrestrial skies}} [[File:Jupiter from Amalthea.jpg|thumb|left|Simulated view of Jupiter from Amalthea.]] From Jupiter's "surface"—or rather, from just above its cloudtops—Amalthea would appear very bright, shining with a [[Apparent magnitude|magnitude]] of −4.7,{{efn|name=stub2}} similar to that of [[Venus]] from Earth. At only 5 [[arcminutes]] across,{{efn|name=sizecalc}} its disc would be barely discernible. Amalthea's orbital period is only slightly longer than its parent planet's day (about 20% in this case), which means it would cross Jupiter's sky very slowly. The time between moonrise and moonset would be over 29 hours.{{efn|name=stub2}} Science journalist [[Willy Ley]] suggested Amalthea as a base for observing Jupiter, because of its nearness to the planet, almost-synchronous orbit, and small size making a landing easy.<ref name="ley196807">{{Cite magazine |last=Ley |first=Willy |date=July 1968 |title=Interplanetary Communications |department=For Your Information |url=https://archive.org/stream/Galaxy_v26n06_1968-07#page/n115/mode/2up |magazine=Galaxy Science Fiction |pages=116–124 }}</ref> From the surface of Amalthea, Jupiter would look enormous: at 46 [[degree (angle)|degree]]s across,{{efn|name=sizecalc}} it would appear roughly 85 times wider than the [[full moon]] from Earth. Because Amalthea is in [[synchronous rotation]], Jupiter would not appear to move, and would not be visible from one side of Amalthea. The Sun would disappear behind Jupiter's bulk for an hour and a half each revolution, and Amalthea's short rotation period gives it just under six hours of [[wiktionary:daylight|daylight]]. Though Jupiter would appear 900 times brighter than the full moon, its light would be spread over an area some 8,500 times greater and it would not look as bright per surface unit.{{efn|name=stub2}}
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