About what percent of all asteroids are C-type asteroids?
A) 5
B) 10
C) 15
D) 50
E) 75
Question 2What are some of the things that make Earth unique in the solar system?
What will be an ideal response?
Question 3Most stars in our part of the Galaxy are formed:
A) alone.
B) in open clusters of a few dozen.
C) in associations of thousands of stars across a spiral arm of the Galaxy.
D) in globular clusters of millions of stars.
E) in a singular event just after the Big Bang.
Question 4Why do we think the first generation of stars would be different from stars born today?
A) Without heavy elements, the clouds could not reach as low a temperature as today and had to be more massive to collapse.
B) Without heavy elements, the nuclear reactions at the center of the stars would be very different.
C) Without heavy elements, there was no dust in the clouds and they collapsed faster.
D) The Universe was much denser when the first stars were born.
E) There were no galaxies when the first stars were born.
Question 5Star formation ceased first in the:
A) nucleus.
B) spiral arms.
C) bulge.
D) halo.
E) galactic disk.
Question 6The atmosphere of Mars is composed of mostly carbon dioxide along with some nitrogen.
Indicate whether the statement is true or false
Question 7The classical model of the hydrogen atom that explains its spectral line structure is due to:
A) Kirchhoff.
B) Bohr.
C) Fraunhofer.
D) Newton.
E) Mendeleev.
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