Emission nebulae are created by gas absorbing ultraviolet energy from the hot young stars within them, such as in the Orion Nebula
Indicate whether the statement is true or false
TRUE
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He discovered that the orbits of planets are ellipses which was not what was conventionally thought to be true that they orbited in perfect circles
a) Copernicus b)Tycho Brache c)Kepler d)Ptolemy
If the Sun was gradually compressed while maintaining its mass in order to form a black hole, how would the curvature of spacetime be affected at the location of the Earth?
A) It would not change because the mass of the Sun is not changing. B) The curvature would become greater because a black hole has stronger gravity than the Sun. C) The curvature would be reduced because the Sun would get so much smaller. D) Compressing the Sun would not form a black hole because a black hole needs to be at least 2—3 times the mass of the Sun.
A simple machine allows you to move ________ masses even though you apply ________.
A. larger; smaller force over a longer distance B. smaller; potential energy deficits C. stationary but not moving; many Newtons of force D. smaller; kinetic energy spread over the entire path