Question

What is sky and where this sky finish???​

Answer 1

Between 500 and 1,000 kilometers above us is the beginning of the exosphere, which extends halfway to the moon. And, as solar radiation overcomes the power of Earth's gravity, it's here that Earth's atmosphere officially ends – and the sky's limits are finally reached.

Answer 2

up into the sky, the sky eventually turns into space. Scientists have to pick a place where space officially starts. One hundred kilometers (67 miles) up is a common dividing line. Scientists call this altitude the Kármán line.