What is the most accurate way to determine the distance to a distant galaxy (a galaxy that is too far away for us to see individual stars)?
A) radar ranging
B) parallax
C) using Cepheid variables
D) using white dwarf supernovae
D) using white dwarf supernovae
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A deuterium nucleus and a tritium nucleus react to yield one alpha particle, a neutron, and energy. For this reaction, the sum of the masses of reaction products after the reaction is ________ the sum of the masses of particles before the reaction.
A. greater than B. equal to C. less than
Galaxies are classified into types solely on the basis of their color
Indicate whether the statement is true or false
In the simplified Drake equation, the total number of life-bearing planets in our galaxy is given by
A) NHP B) flife C) NHP × flife D) NHP / flife
If light of wavelength 600 nm is used to locate an electron to one wavelength of the light, what is the maximum uncertainty in the electron's momentum?
a. 
b. 
c. 
d. 
e. 