Liquid water cannot survive on the surface of Mars because:
A) the atmosphere is too dense.
B) the air pressure is too low.
C) Mars has the highest escape velocity.
D) Mars has never differentiated.
B
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What characteristic do all stars on the main sequence share?
A. They are all fusing hydrogen into helium in their cores. B. They all have the same temperature. C. They all have the same luminosity. D. They will all go through a helium flash in the future. E. They all have the same size.
When strong solar wind storms are diverted poleward by our magnetic fields, we often observe ________ in the ionosphere
Fill in the blank(s) with correct word
An adiabatic free expansion of a gas in a thermally isolated container is not reversible because
a. work must be done on the gas to return it to its original volume. b. heat must be exchanged with the surroundings to return the gas to its original temperature. c. its internal energy has a greater value after the expanded gas is returned to its original volume and temperature. d. of all of the above. e. of (a) and (b) above only.
________ dwarfs are M dwarfs on the main sequence whereas _________ dwarfs are hot, dim, and not on the main sequence
Fill in the blank(s) with correct word