Large molecules found in meteorites and interstellar clouds is evidence that:
A) life is abundant in the galaxy.
B) life has definitely formed in other places than Earth.
C) chemical evolution has taken place elsewhere in the Universe.
D) organic molecules are extremely rare.
E) life originated on Mars before Earth.
C
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If we represent the Milky Way Galaxy as the size of a grapefruit, the distance to the Andromeda Galaxy would be about
A) 3 cm. B) 3 km. C) 30 m. D) 3 m. E) 300 km.
A thin rectangular piece of wood floats in water. You slowly pour oil with a density equal to that of the wood on the surface of the water until the height of the oil above the water is twice the height of the piece of wood. Which statement is correct?
a. The wood floats on top of the oil, so it sticks up in the air. b. The wood does not change its position c. The wood sinks below the surface of the water. d. The wood is half in the water and half in the oil. e. The wood floats in the oil just above the water.
Rank the electric potential energies of the systems of charges shown in Figure OQ25.9 from largest to smallest. Indicate equalities if appropriate