Which Mars mission searched for life in the Martian soil in the 1970's?
A) Pathfinder
B) Phoenix
C) Viking
D) Mariner
C
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If the sequence of the values of sin2 ? for the diffraction peaks of a cubic crystal are 3, 4, 8, 11, 12, 16, 19, then the crystal is _________ cubic.
Fill in the blank(s) with the appropriate word(s).
How does distance between particles and particle motion change as a solid substance becomes a gas?
What will be an ideal response?
According to current understanding, if the universe continues to expand forever, the last major source of light will come from
A) evaporation of black holes. B) the last supernovas. C) collisions between galaxies. D) gamma-ray bursts.
In the outer regions of the solar nebula where temperatures were low,
A) only rock and iron could condense B) only hydrogen compounds could condense as ices C) hydrogen and helium gases were able to condense D) in addition to rock and iron, hydrogen compounds also condensed as ices