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The Solar System

Why do Planets Orbit the Sun?

The attraction of gravity between the Sun and the planets
causes the planets to move around the Sun in an almost
circular path. This circular path is called the planet's orbit.

The direction of the pull of gravity is always towards
the centre of the mass as shown in the picture below.

Gravity making Earth Orbit the Sun

If gravity is pulling the Earth into the centre of the Sun,
why does the Earth move in a circle?
Why doesn't the Earth crash into the centre of the Sun?
(continued on the next page).

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