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Our Solar System

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Nouran Gebril

on 11 March 2017

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Transcript of Our Solar System

Our Solar System
The inner planets:

We have 4 inner planets; Mercury, Venus, Earth and Mars which can be called as terrestrial planets because they are made from rocks.
Which planet do you think is closer to the Sun?
1) Earth
2) Venus
3) Mercury
It's Mercury!

Temperatures on Mercury can reach 430يثلقث degrees and at night it cools to -170ْ degrees.

Our Solar System was formed about 5 million yrs ago from dust and gas.

Gravity pulled the dust and gas to make all the stars and planets.

There are 4 inner planets, an asteroid belt, 4 outer planets and dwarf planets in the asteroid and beyond the outer planets.
Mars is known as the Red Planet because the surface is made of a red mineral that contains iron. Mars is the only other planet that may once have had life on due to the ice surface that it has at the button and that water once flowed in there which we knew from the Curiosity mission launched in 2012.
About Venus and Mercury

Venus reflects a lot of light from the sun which in some positions can look like a star, sometimes it's called a Morning Star or the Evening Star, but it's not a star. Venus has an atmosphere and it's mainly carbon dioxide which is a greenhouse gas. Its atmosphere traps energy from the Sun, so its surface is hotter than Mercury even though it's further from the Sun. The average surface temperature of Venus is over 460ْ degrees.

What is the Solar System?
A Solar System is a collection of planets in orbit around a star. The star at the centre of our Solar System is the sun.
The asteroid belt is between Mars and Jupiter. There are millions of asteroids in the asteroid belt , which are pieces of planets or moons, or lumps of rock left over from when the Solar System was formed and they orbit around the sun like planets do. Ceres is largest asteroid and it's also a dwarf planet which is one third the size of the Moon.
The asteroid belt
The outer planets
The four outer planets, Jupiter, Saturn, Uranus and Neptune are bigger than the inner planets. The outer planets have rings made of dust, ice particles and pieces of rock.
Jupiter & Saturn
Uranus & Neptune
1) Called gas giants

2) Mainly made of hydrogen and helium gas
1) Called ice giants

2) Made of ice and rock with outer layer of gas

3) Have the coldest atmospheres
Dwarf planets
Pluto was a planet until 2006, then astronomers found other objects like Pluto beyond Neptune, so they started calling Pluto a dwarf planet. There are 5 planets in the Solar System including Ceres, which is an asteroid.
Size and Distance
Now, open your textbook page 61 on (size and distance)
Full transcript