Question

3. How Much Does the Earth/Sky Weigh?

Answer 1

 The Earth weighs around 6,000,000,000,000,000,000,000,000 kg.

Answer 2

Earth has no weight, it only has mass. Mass of Earth is approximately 6x10^24 kilograms. I don't know what you mean by sky. Sky is not a scientific term. If you mean anything 'above' earth, then again it is very vague since there is no above or below in space and that's where earth is. Atmosphere, the encasing of gases around the earth on whose lower levels weather patterns take place and whose composition is the reason you perceive the 'sky' to be blue, has a mass of about 5.14x10^18 kg. Beyond the atmosphere is outer space and according to WMAP, mass of the universe is 9.9x10^(-30) grams per cubic centimeter of volume (5.9 protons per cubic meter).....