Space
space is very interesting mainly because of how different it is compared to earth which makes since but what's very interesting is how some waves are able to pass through the reaches of space while other waves are not able to like light waves are able to go from the sun to us with no problem but sound waves it is impossible for the waves to go through space and that is because in the world there are mechanical waves like sound would be one and that means they need a medium to travel through to carry the energy like on earth they would be air generally but in space there is no medium for it to travel through however something like light is an electromagnetic wave which means it can travel even if it doesn't have a medium this is why we are able to get light from the sun.
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