SamuelCampbell — 2022-02-10 09:31:29 UTC For example, comet Shoemaker-Levy 9 was so named because it was the ninth short-periodic comet discovered by Eugene and Carolyn Shoemaker and David Levy. On Earth, in the place where tides are highest, the difference between low and high tides is only 18 m (60 feet), and this is for water, not solid ground! The sun and the rest of the solar system formed from a giant, rotating cloud of gas and dust called a solar nebula about 4.5 billion years ago. The rings are thought to be relatively young and short-lived. Some of the larger rings are surrounded by belts of fine dust. But Pluto is definitely the Roman spelling. But even at this speed, it takes us about 230 million years to make one complete orbit around the Milky Way. The parent body, Haumea, apparently collided with another object that was roughly half its size. Rolling plains are moderately cratered. Over billions of years, these impacts have ground up the surface of the moon into fragments ranging from huge boulders to powder. Its resonance with Dione excites its orbital eccentricity, which is damped by tidal forces, tidally heating its interior, and possibly driving the geological activity. The energy produced in the core powers the sun and produces all the heat and light the sun emits. The temperature drops below 3.5 million degrees Fahrenheit (2 million degrees Celsius) in the convective zone, where large bubbles of hot plasma (a soup of ionized atoms) move upwards. The M-types are metallic (nickel-iron). Its diameter came out slightly larger than expected, at 753 miles (1212 kilometers). Europa orbits Jupiter every 3.5 days and is locked by gravity to Jupiter such that the same hemisphere of the moon always faces the planet. Galileo had recorded it as a fixed star during observations with his small telescope in 1612 and 1613.