The critical temperature above which pair production can occur is called the:
A) Chandrasekhar Limit.
B) Cosmological Constant.
C) fusion temperature.
D) threshold temperature.
E) event horizon.
Question 2
Venus' lack of magnetic field means that:
A) there is no lightning on Venus.
B) the surface of Venus has no protection from the Sun's radiation.
C) it doesn't have a liquid metallic core.
D) Venus' upper atmosphere is permanently ionized.
E) there are constant aurorae everywhere on Venus.