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How far up is the sky from us on earth?

How far up is the sky from us on earth?
Christina still from Bournemouth (Aged 5-14)

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2 Responses

  1. Hi Christina

    I suppose it depends on what you count as the sky.

    The Earth’s atmosphere is divided into six layers. The closest one to the surface is called the “Troposphere”, It varies in height from 8 km (5 miles/26,400 feet) at the poles to 17 km (11 miles/58,080 feet) at the equator. All weather is contained within this layer.

    The furthest layer away is called the “Exosphere”. On Earth, its lower boundary at the edge of the thermosphere is estimated to be 500 km to 1000 km above the Earth’s surface, and its upper boundary at about 10,000 km. Above that is what’s commonly called “Outer Space”.

    Hope that helps

    Martin

  2. Hi Young Scientist :).
    From as high as a cloud usually. We think of clouds as being in the sky and sometimes clouds can even reach ground and sea level so it really is that uncertain where the ”sky’ can be said to begin! However let us set out with some sensible lower level (lets say where most low clouds spend most of their time) then explore upwards (lets say to where there is no more of our atmosphere which contains the balance of gasses in which we live on the ground). That is at an altitude of about one hundred kilometres or 32500 feet above sea level by the way! Low level cloud or ‘Cumulus’ float above us at a height of about two and a half kilometres or 8000 feet above sea level so we may choose to consider that the ‘sky’ we normally see extends from a height of roughly 2 km to 100 km above us.
    On a fine, sunny day we often see the low altitude Cumulus clouds (often called ‘fair weather Cumulus’) as little puffs of white floating in a blue sky. The blue background is created by some ( white ) sunlight, which our part of the planet is bathed in, being separated or ‘scattered’ ( from this ) as it passes through our atmosphere.
    There are a great many more fascinating facts to learn about the sky and where things are and how it all works together but I hope this answers your question. Why not ask more?
    Good Luck,
    Rockno3.

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