Of the normal matter in the Milky Way, the vast majority of the mass is in the form of gas and dust.
Answer the following statement true (T) or false (F)
False
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You observe two distant galaxies (well outside our Local Group of galaxies). You find that Galaxy W is moving away from us at a speed of 35,000 km/s and Galaxy X is moving away from us at a speed of 70,000 km/s. What can you say about the distances to those galaxies?
A) Galaxy W is four times as far as Galaxy X. B) Galaxy W is twice as far as Galaxy X. C) She can't say anything about the distances to Galaxy W or X. D) Galaxy X is four times as far as Galaxy W. E) Galaxy X is twice as far as Galaxy W.
Gluons
a. are carriers of the color force b. posses color charge c. can interact with each other via the color force d. can form glueballs e. all of the above
The densely packed neutrons of a neutron star cannot balance the inward pull of gravity if the total mass is:
A) less than 1.0 solar masses. B) greater than Schwartzschild's limit of 3 solar masses. C) Chandrasekhar's limit of 1.4 solar masses. D) between 1.4 and 2.0 solar masses. E) greater than 25 solar masses.
How many focal points does a lens have?
a. None. b. One. c. Two. d. Three. e. An infinite number of possible locations.