In an H-R Diagram, stars with the smallest radius are found in the ____ of the diagram
a. center
b. upper left corner
c. upper right corner
d. lower left corner
e. lower right corner
D
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Why don't we expect to find life on planets orbiting high-mass stars?
A) The lifetime of a high-mass star is too short. B) The stars are too hot to allow for life. C) Planets cannot have stable orbits around high-mass stars. D) The high-mass stars emit too much ultraviolet radiation.
What do we call the line that the Sun traces across the celestial sphere?
A. the extension of Earth's equator on the celestial sphere B. the Celestial Equator C. the ecliptic D. the Mason-Dixon Line
The strong force is the force that
a. binds electrons to the nucleus in an atom. b. holds the Moon in orbit around Earth. c. creates the magnetic field associated with sunspots. d. produces the extremely high temperatures in the solar corona. e. binds protons and neutrons together to form a nucleus.
Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 45,000 K?
a. There is no hydrogen in stars this hot. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state. d. Stars of this temperature are too cool to produce an absorption spectrum. e. Stars of this temperature are too hot to produce an absorption spectrum.