Your weird cousin, who is really into astronomy, decides that the return address he uses on his letters is incomplete! To his city, state, and country, he begins to add: "North America, Earth, Solar System..." If he now wants to include the name of the Galaxy's spiral-structure feature in which the Earth is located, how should his address end?
A) Cygnus Arm
B) Orion Spur
C) Perseus Arm
D) Sagittarius-Carina Arm
E) Mars arm
Section 25.3: The Mass of the Galaxy
Correct Answer:
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Q1: Astronomers making observations in our Galaxy have
Q2: Which of the following statements about dark
Q3: How do astronomers measure the mass that
Q4: Recently, astronomers have observed stars and other
Q5: Which of the following statements about the
Q7: The very strong source of radio waves
Q8: The scientist who made the first telescopic
Q9: Radio astronomy has played a pivotal role
Q10: An astronomer needs to measure the distance
Q11: Astronomers today know a lot about the
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