What observed feature of the Milky Way is better explained by the bottom-up hypothesis of galactic formation, as opposed to the monolithic collapse model?
a. The elongated shape of the central bulge of the galaxy
b. The different metallicities of the bulge and disk of the galaxy
c. The difference in age of globular clusters
d. The supermassive black hole found at center of the galaxy
e. The very little gas or dust that halo contains
c
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______________ is the point in Earth's orbit where Earth is closest to the sun
a. Aphelion b. Perihelion c. Precession d. The winter solstice e. a and d
Whenever the net force on an object is zero (¤F = 0), the object is said to be in mechanical equilibrium—this is known as the _______________________
Fill in the blank(s) with the appropriate word(s)
Note the expression: y = A/x3 . Which statement is most consistent with this expression?
a. y is less than A. b. If x is halved, y is multiplied by eight. c. If x is doubled, y is multiplied by a factor of 8. d. y is greater than x.
A__________is a stellar object with such low mass that it cannot raise its central temperature high enough to sustain hydrogen fusion
A) T Tauri star B) Herbig-Haro object C) brown dwarf D) protostar