<P> The asteroid 87 Sylvia is one of the largest main - belt asteroids and the first asteroid observed to have two moons . These moons, Romulus and Remus, would appear roughly the same size . Romulus, the farther one, would be about 0.89 ° across, slightly bigger than the closer but smaller Remus, which would be about 0.78 ° across . Because Sylvia is far from spherical, these values can vary by about a little more than 10%, depending on where the observer is on Sylvia's surface . Since the two asteroidal moons appear to orbit (as best we can tell) in the same plane, they would occult each other once every 2.2 days . When the season is right, twice during Sylvia's 6.52 year orbital period, they would eclipse the Sun, which, at 0.15 ° across, is much smaller than when seen from Earth (0.53 °). From Remus, the inner moon, Sylvia is huge, roughly 30 ° × 18 ° across, while its view of Romulus varies between 1.59 and 0.50 ° across . From Romulus, Sylvia measures 16 ° × 10 ° across, while Remus varies between 0.62 ° and 0.19 ° . </P> <P> The asteroid 243 Ida was visited by the Galileo spacecraft on its way to Jupiter . It discovered a small moon named Dactyl . Although the exact orbital characteristics of Dactyl are not fully known, it was 90 kilometers from Ida when Galileo passed by . This would mean that from Ida, Dactyl would appear as large as 1.76 degrees across, which is huge for such a small moon (1.4 km). </P> <P> Although no images from within Jupiter's atmosphere have ever been taken, artistic representations typically assume that the planet's sky is blue, though dimmer than Earth's, because the sunlight there is on average 27 times fainter, at least in the upper reaches of the atmosphere . The planet's narrow rings might be faintly visible from latitudes above the equator . Further down into the atmosphere, the Sun would be obscured by clouds and haze of various colors, most commonly blue, brown, and red . Although theories abound on the cause of the colors, there is currently no unambiguous answer . </P> <P> From Jupiter, the Sun appears to cover only 5 arcminutes, less than a quarter of its size as seen from Earth . </P>

What does the sky look like on jupiter
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