How many moons have so far been discovered orbiting Neptune?
a. 2
b. 13
c. 21
d. 32
e. 40+
b
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Based on observations of the cosmic microwave background, the overall composition of the universe is approximately ________
A) 1% ordinary (baryonic) matter, 99% non-ordinary (nonbaryonic) dark matter B) 4% ordinary (baryonic) matter, 23% non-ordinary (nonbaryonic) dark matter, 73% dark energy C) 100% ordinary (baryonic) matter D) 15% ordinary (baryonic) matter, 85% non-ordinary (nonbaryonic) dark matter
An air mass with circulatory motion is called
A) convectional. B) orographic. C) adiabatic. D) frontal.
Which of the following statements does not use the term light-year in an appropriate way?
A) It will take me light-years to complete this homework assignment. B) It's about 4 light-years from here to Alpha Centauri. C) A light-year is about 10 trillion kilometers. D) It will take the Voyager spacecraft about 20,000 years to travel just 1 light-year. E) The Milky Way Galaxy is about 100,000 light-years in diameter.
What role did Princeton astronomers play in the research on the Big Bang?
What will be an ideal response?