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Nehal Abdrabo, Itzel Reyes, Melissa Smith In the geocentric system Earth is in the center and the planets revolve around Earth. In the heliocentric system Earth revolves around the sun. Galileo used the telescope to discover that four planets revolves around Jupiter. More than 20 years Tycho Brahe recorded and observed the planets. Kepler discover the speed of the planet changes as it revolves around the sun. In the sun’s core the temperature is about 15million degrees Celsius. The sun’s core is hot enough for nuclear fusion to occur. The diameter of the sun’s core is about 400,000km ,30 times bigger than earth’s diameter. Gravity and outward pressure combine to make the sun’s spherical shape. The photosphere, chromosphere, and the corona are The four inner planets are called Earth, Mercury, Venus, and Mars. The inner planets are often called terrestrial planets which means Earth in Latin. Earth is unique because of the liquid water in its surface. Mercury is one of the smallest planet and is also a planet that is closest to the sun. Venus and Earth have similar density also internal structure. Jupiter, Saturn, Uranus, and Neptune are the four outer planets. The four outer planets are often called gas giants because the planets are so large. Saturn is the second largest planet in the solar system. Neptune’s Great Dark spot is about the same size as Earth. Pluto is much smaller and denser than the outer planets. The nucleus, the coma, and tail are the 3 main parts of a comet. The Kuiper belt and Oort cloud are two regions that most comets originate from. The Kuiper belt is a doughnut shaped region. The Oort cloud is a spherical region. Between the orbits of mars and Jupiter, most asteroids revolve around the sun in fairly circular orbits. Comets and/or asteroids are what make meteoroids. If earth was more hot then water would be gas. Scientists have discovered living things that could not exist in those places. At the bottom of the ocean giant tubeworms have been found. Scientists think that may have had conditions (water that were needed for life to exist on mars. There are river like patterns on mars that showed that water one time in life was flowing on mars. Jupiter moon, Europe might have life on it because there may be water on the moon.