There are many theories surrounding how the universe came about. The "Big Bang Theory" is the most sought out for explanation. It suggests everything started by a huge explosion about eight to ten billion years ago. The planets were formed from dust material and debris four and a half million years ago after the explosion of a super nova. The death of this star led to birth of a new star, the center of the universe, we know as the Sun. The remaining debris from the blast was then sucked in as the gravity drove up. The material then came together resulting into the four inner four planets, as of the 100 they originally were, the rest became the Oort Cloud, the Kuiper Belt, and asteroids.

Every 52 years, the Aztecs made a sacrifice for the Sun, believing if they didn't, it would die. The Aztecs were known as "the people of th

e sun." The sun is very important to our survival. Without the Sun, there would be no life on Earth. The sun provides light, heat, and other energy to Earth. The Sun is a huge, glowing ball at the center of our solar system. It is not a first generation star. Nine planets and their moons, tens of thousands of asteroids, and trillions of comets revolve around the sun. Every five billions years our Sun orbits the galaxy. The sun is made up entirely of gas, hydrogen and helium. The part of the Sun that we see has a temperature of about 5500 °C (10,000 °F). The temperature of the solar surface is about 5800 K. Temperatures in the Sun's core reach over 15 million K.

In addition to comets, meteoroids, meteors, and meteorites are also present in the solar system. Though, they are relatively the same thing, they each have significant differences. Meteoroids are small pieces of rock moving through space. A meteoroid that burns up the Earth's atmosphere is known as a meteor. Now, when it strikes the Earth, it is known as a meteorite. Each of these is composed of debris from asteroid collisions, but some are from the moon and mars.

Asteroids are similar to planets in the fact that they are composed of the same materials. The area between the orbits of Mars and Jupiter called the Asteroid Belt is where most asteroids can be located. Sizes of asteroids range from tiny particles to 940 km.

To explore these planets, there have been numerous unmanned journeys to space. First, are the Mariner Missions sent off from 1962 to 1975. These were sent off to investigate our solar system neighbors. The Mariner Missions were powered by arrays of solar cells and had small nuclear generators. It aligned itself using distant star navigation. Another unmanned journey is Voyager. These were a group of several missions in the 1970s set out to explore the far reaches of the solar system. It took 12 years to reach the destinations. Third, is Magellan to Venus in 1990. This was a Radar Mapping mission. And lastly, is Galileo to Jupiter in 1995. Galileo to Jupiter dropped a probe to observe Jupiter's atmosphere.

Next are the inner planets: Mercury, Venus, Earth, and Mars. These four planets are the closest to the Sun. They are called the inner planets. The inner planets are made up mostly of rock. The outer planets are Jupiter, Saturn, Uranus, Neptune, and Pluto. Jupiter, Saturn, Uranus, and Neptune are large balls of gases with rings around them. They are all impossible to stand on. All nine planets travel around the Sun in a different orbit.

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Approximate Word count = 1741
Approximate Pages = 7 (250 words per page double spaced)