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WHAT IS THE DIFFERENCE BETWEEN THE OUTER PLANETS AND THE INNER PLANETS? The astroid belt divides the 4 inner planets (which a made of mostly rock and metals) and the 4 outer planet (which have no surface to land on, the outer layer is made of gas, then liquid is in the inside and there is usually a rock of some sorts in the very depths of these outer planets planets).

WHY DOES EARTH HAVE SEASONS? The reason earth has seasons is because it spins on an angle of about 25.5 degrees so when earth is on the right side of the sun it is summer in australia because of where we are in the world and where the shadow casts, but when it is on the left hand side of the sun it is winter, as you see on the picture directly below. And if we didn't spin on this 25.5 degree angle there would be no seasons

This picture gives you a pretty good idea why we have seasons.

WHY DOES THE MOON HAVE PHASES? The reason the moon has phases is because of the sun. When it is a new moon (which you can see on the diagram below me) you can't see the moon because the other side of it is facing the sun. when it is a full moon (which you can see in the diagram below) all of the sun is facing the side of the moon that we can see, because did you know the other side of the moon has been only seen by spacecraft, because it spins at the exact right speed so that you can only see one side. There is diffrent types of phases of the moon, the diagram directly below the one i have been refering to you at the moment shows you all the phases! You know what i think i may confused you a little there so just look at the diagrams below and you'll under stand.

Heres a cool video clip explaning why the moon has phases.

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EXPLAIN THE FORCE CALLED GRAVITY

Scientists are'nt actually quite sure how the force called gravity work, so there still trying to find out how exactly the force called gravity works! One theory for the way force works is from how much weight theres on, well anything including you, so even we make gravity! The more weight earth has on it the more gravity. I think astrophisists worked that out from black holes because something like one teaspoon of a black hole equals an equivalent to something like 100 tones! So they think thats why weight makes gravity because black holes suck everything into it, black holes are just mass compacted into the tiniest little component, usually caused by a massive explosion.

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