Long-period comets are believed to originally come from
A) the Kuiper belt.
B) the Oort cloud.
C) the satellite system of Jupiter.
D) the interstellar medium.
E) the asteroid belt.
B
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The moon's distance from Earth is measured very accurately by bouncing a laser beam off of a small mirror left on the surface of the moon. If a laser is fired at the moon and the signal returns in 2.6 seconds, what is the distance to the moon?
a. 390,000 km b. 390,000 m c. 780,000 km d. 780,000 m
Components: The x component of vector 
is 8.7 units, and its y component is -6.5 units. The magnitude of 
is closest to
A. 9.9 units. B. 7.9 units. C. 8.9 units. D. 11 units. E. 12 units.
RR Lyrae stars pulsate, but with shorter periods and lower luminosities than Cepheids
Indicate whether the statement is true or false
Nuclear Binding Energy: How much energy is released when 0.60 ?g of 3H have decayed to 3He? The mass of 3He is 3.0160293 u, the mass of 3H is 3.0160492 u, 1 u = 931.5 MeV/c2, 1 eV = 1.60 × 10-19 J, and NA = 6.022 × 1023 molecules/mol.
Fill in the blank(s) with the appropriate word(s).