If there were no atmosphere, the sky would be all black, except for the area directly around the sun, which you would not be able to look anywhere near because it would be so bright, as there would be no atmosphere to block its rays.
Contagion and contagiousness refers to how easily the spread of Genetic Disease is possible from one person to another. Other words for contagion include infection, infectiousness, transmission or transmissability. Contagiousness has nothing to do with genetics or inheriting diseases from parents.
Contagion summary: All types of genetic diseases occur at birth. You cannot catch the disease from someone else who has the disease. You are either born with the genetic disease in your DNA or not.So the disease can be inherited from your parents through the DNA, but cannot be caught later in life. No person with a genetic disease is contagious or infectious or able to transmit the disease to another person.o the disease can be inherited from your parents through the DNA, but cannot be caught later in life. No person with a genetic disease is contagious or infectious or able to transmit the disease to another person.