The analysis of Martian meteorites found on the Earth show that they contain
A) only tantalizing hints of possible life.
B) fossilized remains of multi-cellular insects.
C) fossilized remains of small, mammal-like creatures.
D) bacteria with DNA very different from bacteria on Earth.
E) bacteria with DNA closely related to bacteria on Earth.
A
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How did Harlow Shapley determine where the center of the galaxy lies?
a. He plotted the distribution of open clusters. b. He plotted the distribution of globular clusters. c. He made star counts in every direction of the galactic disk. d. He measured the amount of dust obscuration in every direction of the galactic disk.
On a graph of luminosity versus color for galaxies, shown below, many galaxies form a clump known as the "blue cloud." Why are galaxies in the blue cloud blue?
A) They contain hot, young stars that indicate active star formation. B) They are moving slower than galaxies in the red cloud. C) They contain lots of dust that cause the bluish color. D) They contain cold, dying stars that are fading to black. E) They are all moving toward us, causing them to be blueshifted.
What is the observational difference between Types I & II supernovae?
A: Ia's come from white dwarfs in binaries whereas II's come from dying massive stars B: I's are brighter than II's C: I's are fainter than II's D: I's are Hydrogen poor while II's are Hydrogen rich E: I's have no central remnant while II's have neutron stars
Because of its axial tilt and more elliptical orbit, Mars' polar caps change size even more than the Earth's do
Indicate whether the statement is true or false