There are two theories that can explain this phenomenon. The first one states that when ice particles within a cloud collide, they break into particles with both positive and negative charges. Then gravity pulls the negatively charged particles downward, while the positively charged particles go up, resulting in an imbalance.
However, there is another theory that involves cosmic rays from space that strip off negatively charged electrons. Truth is nobody knows for sure.
Also, lightning is incredibly hot. For example, a flash is able to heat the air that’s around it to temperatures that are five times hotter than the Sun’s surface. This heat causes surrounding air to quickly vibrate and expand. This creates the pealing thunder we hear a few seconds after seeing a lightning flash.
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In order to HAVE time you need at least two objects that are not like each other in any manner. In the situation where that does exist movement of one relative to the other is time. We have that situation.