![]() That’s a bad thing for life on the surface – it couldn’t survive. Europa’s surface is blasted by radiation from Jupiter. The type of life that might inhabit Europa likely would not be powered by photosynthesis – but by chemical reactions. As such, a year on Neptune is the longest of any planet, lasting the equivalent of 164.8 years (or 60,182 Earth days). Given its distance from the Sun, Neptune has the longest orbital period of any planet in the Solar System. Which planet has the longest year in our solar system? How long is a day on Callisto?Ī day on Callisto is about 17 Earth days, the same amount of time it takes Callisto to orbit Jupiter once. Callisto’s circumference at its equator is about 9,410 miles (15,144 kilometers). Is Callisto bigger than Mercury?Ĭallisto is Jupiter’s second largest moon after Ganymede and it’s the third largest moon in our solar system. This makes it very reflective of the Sun, which makes it look like it is glowing. … But more likely the gravity of Jupiter is to blame for Ganymede’s continuing geological activity.Īdvertisement Why does Callisto moon Glow?Įven though it is old and heavily cratered, Callisto has a lot of ice across it’s surface. Some surface features could be as young as the surface of Venus (a few hundred million years). Thus, Ganymede is not a dead world but rather a place of intermittent geological activity powered by an internal heat source. … And, like the other gaseous planets, you technically could not live on Saturn simply because it has no solid surfaces. Recognized by people of all ages for its magnificent ring system, Saturn is one of the four gas giants of the outer solar system. Europa is almost the same size as Earth’s moon, while Ganymede, the largest moon in the Solar System, is larger than planet Mercury. What are the 4 biggest moons of Jupiter?ĮSA Science & Technology – Jupiter’s largest moonsįrom top to bottom, the moons are Io, Europa, Ganymede and Callisto. ![]() Can we live on Titan?Īlthough there is so far no evidence of life on Titan, its complex chemistry and unique environments are certain to make it a destination for continued exploration. Scientists believe it is a dead world with no signs of geologic activity like plate tectonics or volcanism on its surface. The surface of Callisto is the most heavily cratered and also one of the oldest landscapes in our solar system. There are more craters on Callisto than any other object in the solar system. ![]() What does Callisto have more of than any other body? However, its distance from Jupiter means it doesn’t experience such a strong gravitational pull, so it’s not as geologically active as the other Galilean moons of Io and Europa. Can life exist Callisto?Ĭallisto has a very thin atmosphere, is thought to contain an ocean, and is therefore another possible contender for life beyond Earth. It has a smooth and bright surface, with a layer of water surrounding the mantle of the planet, thought to be 100 kilometers thick. The name comes from a mythical Phoenician noblewoman, Europa, who was courted by Zeus and became the queen of Crete, though the name did not become widely used until the mid-20th century. Which Galilean moon has the smoothest surface? Callisto’s rotation is tidally locked to its orbit around Jupiter, so that the same hemisphere always faces inward. It is not in an orbital resonance like the three other Galilean satellites-Io, Europa, and Ganymede-and is thus not appreciably tidally heated. Why is Callisto not in orbital resonance? What is the most likely reason for the different levels of geological activity between the Galilean moons? Moons farther away from Jupiter experience weaker tidal heating. What is the most likely reason for the different levels of geological activity between the Galilean moons? The lighter regions show no signs of craters and it is thought that eruptions of water covered the surface before freezing over. Ganymede: Largest Moon in the Solar System
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