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TC’s Space project A Tour Through Space Sun The sun is a star. Because it’s much closer to us it looks very hot and bright. The sun is a huge ball of gases. The two main gases are hydrogen and helium. Planet Mercury Mercury was known to the Romans as the Messenger to the Gods. Mercury is the planet closest to the sun, but it is not the hottest. Of all the nine planets in our solar system, only Pluto was smaller than Mercury. Planet Venus Venus is the second planet from the sun. It is the hottest planet in the solar system. It is 67.2 million miles away from the sun. It has no moons. Planet Earth Earth is the only one that can support human life out of all the planets. Earth is a average planet. It is bigger than four of the planets and smaller than the other four. Planet Mars Mars is smaller and colder than Earth. In August 1996 Mars was found. Mars is more like Earth than any other planet, but it is still very different. Planet Jupiter Jupiter is the largest planet in the solar system. It is 54,000 degrees Fahrenheit. It is 30,000 degrees Celsius. The pressure of Jupiter’s atmosphere will crush any human or machine that falls through the clouds. Planet Saturn Saturn is the famous ringed planet. Saturn’s rings are made of ice and rock. Saturn’s ring span is about 600,000 miles. They are not solid, but consist of small chunks of frozen material in a layer of a few thousand feet thick. Planet Uranus Uranus was discovered in 1781. Many sky watchers recorded Uranus. Uranus has a side ways spin. Uranus has a sideways spin. Planet Neptune Neptune is the fourth planet in the solar system. It was discovered in 1846. Neptune has eight moons. Neptune’s moons are colder than the planet itself. Asteroids Most asteroids lie between Mars and Jupiter. One of the asteroids may have caused an extinction to dinosaurs 65 million years ago. Comets Comets can decorate our night skies in spectacular fashions. Comets are sometimes described as dirty snowballs. As comets reach the sun they start to dissolve. The closer they get to the sun the more they disolve. Meteors Meteors are small pieces of dust and rock. Some of them end up as shooting stars. Most of the meteors we see at night come from comets.