The flat rotation curves of spiral galaxies tell us that they contain a lot of dark matter. Do they tell us anything about where the dark matter is located within the galaxy?
A) Yes, they tell us that dark matter is spread throughout the galaxy, with most located at large distances from the galactic center.
B) Yes, they tell us that dark matter is concentrated near the center of the galaxy.
C) Yes, they tell us that dark matter is spread uniformly throughout the galactic disk.
D) No, we cannot determine anything about the location of dark matter from the rotation curve.
A) Yes, they tell us that dark matter is spread throughout the galaxy, with most located at large distances from the galactic center.
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The central star of the Crab Nebula has now collapsed into a ________, whose energy keeps this famous nebula visible even in binoculars
Fill in the blank(s) with correct word
According to modern understanding, protons and neutrons are each composed of
A) three leptons. B) two fermions. C) three quarks. D) four bosons.
Quantum theory was developed
A) almost in its entirety by Erwin Schroedinger. B) almost in its entirety by Max Planck. C) almost in its entirety by Albert Einstein. D) by Planck, Schroedinger, Einstein, and many other scientists. E) in its entirety by Planck, Schroedinger, and Einstein.
A gasoline engine absorbs 2 500 J of heat at 250°C and expels 2 000 J at a temperature of 50°C. The magnitude of the change in entropy (in J/K) for the system is
a. 6.2 b. 4.7 c. 1.4 d. 10.9 e. 3.2