What is the approximate density of the Earth?
A. 1 g/cm3
B. 5 g/cm3
C. 25 g/cm3
D. 50 g/cm3
Answer: B. 5 g/cm3
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What is spacetime?
A) It's the inseparable combination of space and time. B) It's time that we measure when traveling in space. C) It's a graph with four axes. D) It's a way of viewing books at different angles.
How does the mass of Jupiter compare with that of the other planets?
A) It is slightly larger and more massive than Saturn. B) It is similar to that of the Earth and Venus. C) It is twice as massive as all other planets combined. D) It is almost as massive as Saturn. E) It is about a tenth the mass of the Sun.
The surface of Earth is an example of a free-float reference frame
Indicate whether the statement is true or false
A star is seen to have two transiting planets. Planet 1 transits every 3 months, and Planet 2 transits every 15 months. What can we infer about their orbits?
A) Planet 2's semimajor axis is larger than Planet 1's. B) Planet 1's orbit is more eccentric than Planet 2's. C) Planet 2's orbit is more eccentric than Planet 1's. D) Planet 1's semimajor axis is larger than Planet 2's.