What are the two major ways in which extrasolar planets have been discovered?
A) direct imaging with large telescopes
B) measuring changes in the star's brightness when a planet transits
C) measuring the motion of the star due to the planets' gravitational tugs
D) A and B
E) A and C
F) B and C
Question 2
What will happen in the Sun immediately after it has exhausted its supply of hydrogen in its core?
A) The core will collapse and a supernova will result.
B) The Sun will turn into a white dwarf and cool off forever.
C) The helium core will shrink, heat, and start fusing helium to carbon.
D) The helium core will shrink and heat; a shell of hydrogen will start fusing.
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