Which moon orbits a body only twice as big as it is?
A) Triton B) Charon C) our Moon D) Mimas E) Miranda
B
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Kepler's Laws: It takes the planet Jupiter 12 years to orbit the sun once in a nearly circular orbit. Assuming that Jupiter's orbit is truly circular, what is the distance from Jupiter to the sun, given that the distance from the earth to the sun is 1.5 × 1011 m?
A. 3.9 × 1011 m B. 5.2 × 1011 m C. 7.9 × 1011 m D. 9.7 × 1011 m E. 3.2 × 1012 m
Which of the following kinds of signal do we currently have the best chance of detecting with currently technology?
A) a signal used for communication between a civilization's home world and another star system B) a signal used for communication between a civilization's home world and another planet in its own planetary system C) an intentional signal beacon D) a signal used for local communication in the world where the intelligent beings exist
A star like the Sun emits a(n) ____ spectrum
a. absorption b. emission c. continuous d. Doppler e. ionization
The Jovian planets have lower average densities than the terrestrial planets
a. True b. False Indicate whether the statement is true or false