I believe its true, i'm not entirely sure.
Answer:
Maybe cultural. I am not sure though
Answer: It is the result of a mixture of radiation from many independent sources, such as stars and galaxies.
Microwave background radiation is a form of electromagnetic radiation that is present in the whole universe and completely fills it. In fact, it is the leftover radiation from the Big Bang that occurred 400,000 years before the events related to this cosmic radiation.
Its frequency belongs to the microwaves range and is one of the main demonstrations of the of the Big Bang theory model.
What, is being called the midpoint exactly? My guess would be that Point C is the midpoint because it is the middle point of a line segment.
