The cluster method (motions of galaxies in a cluster of galaxies) can be used to determine the cluster's mass
a. luminosity.
b. distance.
c. mass.
d. diameter.
e. age.
C
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Which new process was added to the nebular theory of solar system formation to account for the existence of Jupiter-mass planets that orbit close to their stars (the "hot Jupiters")?
A) Planets can migrate from the orbits in which they are born. B) In addition to the categories of terrestrial and jovian, there must be an "in-between" category of planet that has the mass of a jovian planet but the composition of a terrestrial planet. C) In some star systems, it is possible for jovian planets to form in the inner solar system and terrestrial planets to form in the outer solar system. D) Giant impacts can affect planets after they form.
Suppose that a heavy person and a light person are balanced on a teeter-totter made of a plank of wood. Each person now moves in toward the fulcrum a distance of 25 cm. What effect will this have on the balance of the teeter-totter?
A) The teeter-totter will remain in balance. B) The heavy person's end will go down. C) The light person's end will go down. D) One cannot tell whether either end will rise or fall without knowing the relative mass of the plank. E) Only if the plank has significant mass will the light person's end go down.
When a wave is ______________, the angle of reflection equals the angle of incidence
Fill in the blank(s) with correct word
Refer to the sketch above of an H-R diagram for a star cluster. Which statement about this cluster is true?
A) It is probably located in the disk of the galaxy. B) It contains some stars that will soon undergo supernova explosions. C) It is probably located in a globular cluster. D) It is probably embedded in a molecular cloud in which new stars are being born.