Review of the points covered

• The Earth, the Sun and the Moon are all spheres.
• The Sun is the biggest object in our solar system and is about 110 times bigger in diameter than Earth.
• The Moon is about 1/4 the size of Earth.
• Earth is the fifth largest planet in our Solar system.
• The Earth, the Sun and the Moon are all about the same age - 4.5 billion years.
• The Earth, the Sun and the Moon have a similar layered structure.
• The Sun is the brightest object in our sky.
• The Sun is a light source. It provides us with the light that enables us to see during the day.
• The Moon is the second brightest object in our sky.
• The Moon is not a light source. It reflects light from the Sun.

• Distances in space are huge.
• It is a long way to the Moon.
• It would take a long time to get to the Moon and back travelling at speeds we are used to.
• It is a very, very long way to the Sun.
• Travelling at the speed of a fast car it would take more than a life time to get to the Sun.
• Long distances make large objects look small.

• Objects attract each other.
• Large objects have more gravity than small objects.
• Gravitational force decreases with distance.
• It is gravity that causes one object to orbit another.
• All objects have mass, an amount of material that is the same wherever it is.
• Gravity acts on mass to give it weight.
• Weight changes due to location.
• The speed of an object controls the height of an orbit.
• High speeds can make an object leave orbit.
• Low speeds can make an object fall to Earth.

• The Earth moves in an elliptical orbit around the Sun.
• The Moon moves in a circular orbit around Earth.
• It takes a year for the Earth to complete one orbit of the Sun.
• It takes the Moon about 29.5 days to complete an orbit of the Earth.
• The Earth's rotational axis is inclined at an angle of 23.5° to the plane of revolution around the Sun.
• The Earth's axis always points in the same direction.
• The Sun appears high in the sky during summer and low in the sky during winter.
• There are man made objects in orbit around the Earth.
• Man made satellites are not spherical like the Earth, Sun and Moon.

• The Earth spins around its axis once every 24 hours.
• Day and Night are the result of the Earth spinning around its axis.
• The Sun rises in the East and sets in the West.
• The Moon and the Sun exert a gravitational pull on the Earth.
• High and Low tides are caused by the gravitational pull of the Sun and Moon on the seas and oceans as the Moon orbits the Earth.
• Knowledge of the tides is useful when boats are entering and leaving port or for preventing floods.
• Spring, Summer, Autumn and Winter are different seasons that are caused by the Earth orbiting the Sun.
• Knowledge of the seasons is helpful when planning farming and other annual activities such as Christmas.
• Eclipses are caused when the Moon moves to a position between the Earth and the Sun.
• The Moon's phases are caused by shadows when light from the Sun illuminates the Moon from different angles as it orbits the Earth.