Page 155 - Knowledge Organiser Yr8 24-25

Knowledge Base: Science 8.13 Space Year 8
3. The Milky Way & the Sun
3.1 What is a galaxy?
3.2 What galaxy is Earth in?
a collection of stars.
Milky Way galaxy.
4. Our solar system
4.1 What makes up our solar system?
4.2 What are the 4 inner planets?
4.3 What are the 4 outer planets?
4.6 Is Pluto a planet?
the Sun, 8 planets and the asteroids belt.
The inner planets (rocky planets) are: Mercury, Venus, Earth and Mars. The outer planets (gas giants) are: Jupiter, Saturn, Uranus, Neptune
No, it is now classified as a dwarf planet.
3.3
How are the stars in our galaxy held together?
All of the stars are held together by the force of gravity.
3.4
What is the sun?
The star at the centre of the solar system
3.5
What is a star?
A large object that produces its own light (and heat).
3.6
Are all stars the same size?
Our sun looks big because it is closest to us. Other stars further away are much bigger than our Sun. For example, Betelgeuse
is about 900 times bigger than our Sun
3.7
Can planets produce their own light like stars?
Planets cannot produce their own light. Light is reflected off the surface of a planet so that we can see it.
3.8
What will happen to the sun when it comes to the end of its life?
Our Sun will eventually form a white dwarf: A dense, dim smaller star.
3.9
Do all stars have the same life cycle?
Other stars that are much bigger than ours, will have a different life-cycle. They may form black holes or supernovas.
4.4
What is the asteroid belt? Where is the asteroid belt?
Between Mars and Jupiter is the Asteroid Belt, which is made up of pieces of rock and dust.
4.5
What do the planets in our solar system orbit around?
All of the planets orbit around the sun and are held in place by gravity.
5. Days & Years
5.1
What is the Earth’s axis?
An imaginary line through the centre of the Earth, which the Earths spins around. The Earth’s axis is tilted at 23.5o.
5.2
What is a day?
How long it takes for the Earth to complete one full rotation on it’s axis – 24 hours
5.3
When is there day-time on Earth?
The side of the Earth that is facing the Sun will be in daytime because the light rays hit the surface of the Earth.
5.4
When is there night-time on Earth?
The side of the Earth that is facing away from the Sun will be in night time because it is in the shadow of the Earth. None of the light rays can reach the surface on this side.
5.5
What is a year?
One year on Earth is 365.25 days. This is how long it takes to complete one whole orbit around the Sun.
5.6
Do all planets have the same time for orbiting the Sun?
Different planets have different time periods to orbit the sun, depending on how far away they are from the Sun. The further away, the longer it takes
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