What astronomical period takes 18 years 11 1/3 days to complete?
a. synodic cycle
b. lunar phase cycle
c. eclipse season
d. sidereal period
e. Saros cycle
e
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Which of the following best describes how the Drake equation is useful?
A) It helps us understand what we need to know to determine the likelihood of finding other civilizations. B) It has allowed us to determine the number of civilizations in the Milky Way Galaxy. C) It allows us to calculate the masses of planets orbiting other stars. D) It tells us what wavelengths of light will be most useful to examine in the search for extraterrestrial intelligence.
The first modern astronomer to propose a heliocentric model for the solar system was ____________________
Fill in the blank(s) with correct word
How much energy does a 100 watt light bulb use in 1 hour? Express your answer in (a) joules and in (b) kilowatt-hours. (c) Also find how much money it costs if electricity sells for 10 cents per kW-h
Which large jovian moon is thought to have been captured into its present orbit?
A) Callisto B) Titan C) Triton D) Io