8/17/2023 0 Comments Def of tidal heating![]() ![]() This is because the water from the geysers (which is often ejected HUNDREDS of kilometers above the surface) falls back as snow. Ultimately, this causes the moon to heat up, resulting in liquid oceans on Europa or active geysers on Enceladus. As a neat side-fact, the icy surface of Enceladus is covered with many meters of snow. A different but certainly related definition of a tides. The entire moon slightly changes its shape. When we think of tides on Earth, images of changing sea levels at a beach or lake may come to mind. As the gravitational force changes, the moons are essentially compressed and expanded. (Note: the amount of tidal heating as a result of this force depends on other factors such as the amount of forced eccentricity and the body's internal properties. Thus the tidal force on Europa is a quarter that on Io. As such, it means that the gravitational force is stronger at some points in the orbit than at others. Thus (tidal force on Europa)/(tidal force on Io) (Io orbital radius) 3 /(Europa orbital radius) 3 421.6 3 /670.9 3 0.249. 7 Know that friction (drag) acts on an object. This basically means that, during certain points, the moon is closer to the planet than at others. This means students can be confident that their Cambridge IGCSE qualifications are accepted as. You see, these moons don't orbit their respective planets in perfectly circular orbits - they orbit in ellipses. These moons (of Saturn and Jupiter, respectively) are known as "icy moons." As a result of the extreme temperatures, which are hundreds of degrees below zero, both moons have a thick layer of ice many kilometers deep however, we know that liquid water still exists on them. However, as you may know, most of the other planets aren't so lucky nearly all of them have rather frigid temperatures.įor example, take a look at moons like Enceladus or Europa. Our planet is able to sustain warmth because of its atmosphere and its proximity to the Sun.
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