You’ve probably heard that everything on the universe is made up of atoms and all other normal matters in the Universe are mostly empty space, and atoms are 99.9999999% empty space. That’s actually true.
The final theory of Professor Stephen Hawking on the origin of the universe, which he…
It is the deviation of light or other electromagnetic waves from a straight line as it passes through the atmosphere due to the variation in air density as a function of height.Refraction causes due to the velocity of light through air, decreasing with increasing density.
The roof blown off due to difference in air principal.