is space a rare medium or a denser medium than air ........................
i think it shouldbea rarer medium as it is vaccum

but i have seen that when the lights coming from the star enter our atmosphere the rays go away from the normal ..................... and this could only happen when light rays from a denser medium enter a rare medium
so it means that space is a denser medium.

The space is a rarer and in fact the rarest of all the mediums that we know. The phenomenon which you list as "but i have seen that when the lights coming from the star enter our atmosphere the rays go away from the normal ..................... and this could only happen when light rays from a denser medium enter a rare medium
so it means that space is a denser medium."  



is not possible as whenever the light from the space enters the atmosphere it always bends towards the normal. What you have seen is wrong that cannot happen at all. It is a misconception. 

Please remember that space is the rarest medium of all. There is no other medium which can be rarer that space because speed of light is maximum in space or vaccum.

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