What is the diameter of the galaxy, in km?
A) about 1 billion trillion km (1021 km) B) about 10 trillion km (1013 km)
C) about 1 million trillion km (1018 km) D) about 100,000 km (105 km)
A
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If a net force is applied to an object, what is guaranteed to change?
A) the object's momentum B) the object's speed C) the object's direction of motion D) the object's mass E) the object's weight
The graph above shows 4 models for how the average distance between galaxies could change with time, from the past (left) to now (middle) to the future (right-hand side). The graph also shows real data, based on white dwarf supernovae. Which model predicts that galaxies had the largest separations in the past?
A) accelerating B) coasting C) critical D) recollapsing
The habitable zone is the area around a star where:
A) planets with life have been found. B) human beings could live. C) the Greenhouse Effect is possible. D) a planet could have an atmosphere. E) temperatures are suitable for planets to have liquid water.
If a tree is 15 m tall, its height expressed in feet is x ft, where x is
A) less than 15. B) greater than 15.