Question

When does the Sky become Space?

Answer 1

At some height- most people say this is about 100 km above sea level - the atmosphere becomes so thin that you could begin to think of yourself as being in space. Roughly speaking,this is where you need a vehicle to work more like a spaceship than like a plan.
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Answer 2

Answer:

All sky is a space but it is named as a sky not space because it is covered with atmosphere which contains specific amount of gas which is enclosed by the layer of ozone layer since it reflects the sea and ocean therefore the colour of sky seem to be blue often

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From shivi .......