____________________ is the resistance of a gas to the flow of radiation
Fill in the blank(s) with correct word
Opacity
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Upper-main-sequence stars, more massive than the Sun, fuse hydrogen by the proton-proton chain
Indicate whether the statement is true or false
Answer the following statement(s) true (T) or false (F)
1. If I know a field’s curl at all points in space, I can calculate the field’s vectors at all points in space.
2. In a certain region of empty space, the z component of the magnetic field is changing with time. If we sum 
for a set of tiny steps 
around a closed loop in the xy plane, we will get a nonzero result.
3. In a certain region of empty space, the z component of the magnetic field is changing with time. If we sum 
for a set of tiny steps 
around a closed loop in the xy plane, we will get a nonzero result.
Which of the following puzzles in the solar system cannot be explained by a giant impact event?
A) the backward rotation of Venus B) the extreme axis tilt of Uranus C) the large metallic core of Mercury D) the formation of the Moon E) the orbit of Triton in the opposite direction to Neptune's rotation
Describe the reasoning leading to the idea that the number of technological civilizations in the galaxy is equal to the average lifetime of a technological civilization
What will be an ideal response?