Which of the following are active galaxies?
A. quasars
B. radio galaxies
C. Seyfert galaxies
D. All of these choices are correct.
Answer: D
Physics & Space Science
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To tell the difference between a neutron star and a black hole in an X-ray binary, we must find the temperature of the object
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
When a neutral atom loses an electron, we say that it becomes
A) vaporized. B) dissociate. C) ionized. D) an isotope. E) a plasma.
Physics & Space Science
Globular clusters are found in the Milky Way's
Indicate whether the statement is true or false.
Physics & Space Science
Suppose a radioactive isotope has a half-life of 2.0 hours. For an initial sample of 6400 nuclei, the number remaining after 6.0 hours is about ________.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science