Our Solar system

Write out what you think below Where did our solar system come from? ___________________________________ What makes up our solar system? _______________________________________ How is it organized? _______________________________________ What are some features you know about the components of our solar system (the things you named that make up our solar system)? __________________________________________________

Big Bang theory A theory (a concept, it is not a law) called the big bang theory developed by scientists: Georges Lemaitre, Albert Einstein, Alexander Friedmann and Edwin Hubble is the theory that the universe began with a cosmic explosion sending the dense, hot matter outwards and these evolved into galaxies.

The Universe Many people confuse the universe with the galaxy and with the solar system. Did you know they are different? The Universe consists of millions of galaxies A galaxy consists of possibly many solar systems and millions of stars (Stars are usually born in clusters). The milky way galaxy is only one galaxy in the universe It contains our solar system and millions of stars.

The milky way galaxy The milky way galaxy is a spiral galaxy with four arms Side view of milky way galaxy Milky way galaxy showing the position of our sun and solar system at one arm Our solar system takes 236 million years To orbit the nucleus (core) of the Milky Way Galaxy

Our solar system Consists of our sun – is a star that escaped from its cluster. It is not a huge ball of fire. It is actually made up of a gas Planets – in our solar system we have eight (8) planets and two (2) dwarf planets Asteroids- rocky remains from the formation of our solar system Meteoroids – small particle of debris in space Meteors – when a meteoroid enters Earth’s atmosphere it is called a meteor Meteorites – if a meteor survives the impact with Earth, it is called a Meteorite Comets - A small icy body that when it is close enough to the sun has an observable come or a tail(you can see it) Natural Satellites – are bodies that orbit other objects such as the moon; it orbits Earth and is therefore Earth’s natural satellite

Assignment – RESEARCH and WRITE UP ON THE FOLLOWING 1.In slide 5 what is meant by a light year? 2.What gas is the sun made of and what gas does it make? 3.There are two Asteroid belts in our solar system, name them. 4.What is a dwarf planet? 5.Our planets are classed into two categories: terrestrial and gaseous, complete the table with the relevant information: name the planets and identify two features of each. List in the column “Any natural satellites” natural satellites that planet has. 6.Draw or stick pictures of each planet in your books, a meteoroid, a comet, an asteroid and a natural satellite

Terrestrial planets 2 features Any natural satellites ? Gaseous planets 2 features Any natural satellites ? Dwarf planets 2 features Any natural satellites ?