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.
Three ways that factors affect mortality in response to changes in population density.
The major veins of the body.
Major features of the Solar System (not to scale)
Hurricane Paths: Major Hurricane History
Major Structures of the Human Brain
A Sociological Timeline of Major Figures in the Development of Sociological Theory, 1820–1960