The astronomer who mapped the orbits of stars near the Milky Way Galaxy's supermassive black hole was _____
A. Andrea Ghez
B. Harlow Shapley
C. Walter Baade
D. Caroline Herschel
D. Caroline Herschel
Harlow Shapley deduced that the Sun lies near the central plane of the Milky Way Galaxy and was not at the center but some 30,000 light-years away. Ghez has mapped the Galactic Center with unprecedented angular resolution. Walter Baade classified stars into two distinct population types, found each type had a distinct kind of Cepheid variable (a crucial cosmic distance indicator) and deduced from this that the universe was roughly twice as big and old as previously thought.
Herschel’s Diagram of the Milky Way
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List at least three things that make Earth unique among the terrestrial planets.
Fill in the blank(s) with the appropriate word(s).
Globular clusters contain mostly blue stars
Indicate whether the statement is true or false
A 2.0-kg object moving with a velocity of 5.0 m/s in the positive x direction strikes and sticks to a 3.0-kg object moving with a speed of 2.0 m/s in the same direction. How much kinetic energy is lost in this collision?
a. 2.4 J b. 9.6 J c. 5.4 J d. 0.6 J e. 6.0 J
In beta minus decay, the number of neutrons in the nucleus
A) is decreased by 1. B) is decreased by 2. C) is increased by 1. D) is increased by 2. E) remains unchanged.