Which internal heat source still generates heat within the terrestrial worlds today?
A) heat from radioactive decay
B) heat of accretion
C) heat from differentiation
D) heat from convection
A) heat from radioactive decay
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Which of the following is a drawback of using type Ia supernovae for measuring the distance of galaxies?
A) They are not bright enough to be noticed. B) They cannot be calibrated. C) They are a rare occurrence. D) They occur only in spiral galaxies.
High-mass stars evolve differently than medium-mass stars because they are able to fuse _______________
Fill in the blank(s) with correct word
Atmospheric pressure is 
The pressure of the atmosphere in 
is
A. 9.800. B. 10.90. C. 12.30. D. 14.70. E. 16.30.
An unusual lightning strike has a vertical portion with a positive current of +400 A upwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
A. 0. B. 0.012 N, East. C. 0.012 N, West. D. 0.30 N, West. E. 300 N, East.