The solar system What is the solar system? The Sun, its planets and other objects in orbit are all together known as the solar system.

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Presentation transcript:

The solar system

What is the solar system? The Sun, its planets and other objects in orbit are all together known as the solar system.

The nine planets (starting with the closest to the Sun) Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto

How do these planets move? The Sun is a star which the nine planets move around. The path each planet travels around is called it orbit. The planets are kept in their orbits due to the pulling force of the Suns gravity.

What are moons? Moons are ‘natural satellites’ Moons orbit around a planet The moon stays in its orbit due to the gravitational pull of the planet Our moon has a circular orbit We see the moon because it reflects light

What else is found in our Solar system? Asteroids Meteorites Comets These are minor planets found in their thousands between Mars and Jupiter These are probably fragments of asteroids that broke up These are lumps of ‘dirty ice’ a few km across that travel in highly elliptical orbits. As they near the Sun they warm up. This causes a tail of dust and cloud.

What is a galaxy A galaxy is made up of billions of stars Our galaxy is called the Milky Way galaxy, that has a spiral shape Our Sun is just one of the stars that form the Milky way galaxy The Milky Way is light years across, and the nearest star to Earth (apart from the Sun) is 4.2 light years away

The Milky Way galaxy Our solar system is here

What is a light year? A light year is not a period of time A light year is a distance A light year is the distance that light travels in one year As light travels at a speed of m/s (or km/s) then if we multiply this by the number of seconds in a year we will see that light will have travelled 9.5 x m ( m ) Our galaxy is times this distance across

The Universe There are millions of other galaxies which are seen further and further away in space Galaxies themselves are millions of times further apart than the stars are within a galaxy All these galaxies make up the Universe (which includes all the empty space between galaxies) The Universe is perhaps million light years across

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