Assume the following stars all have the same mass as our Sun. Which one does not have fusion occurring in its central core?
A) a red giant
B) a main-sequence star
C) a helium core-fusion star
D) a main-sequence star in a binary star system
A) a red giant
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If the proto star that became our Sun had been hotter and more luminous when it formed, what changes (if any) might have been experienced by our Solar System?
A) The Moon would not exist. B) Jupiter would now be farther from the Sun. C) No comets could have formed. D) Mars would be a gas giant. E) Terrestrial planes could only have formed closer to the Sun.
At what rate is thermal energy generated in the 5-? resistor when ? = 24 V?
a.
13 W
b.
3.2 W
c.
23 W
d.
39 W
e.
51 W
Open clusters tend to be ____ than globular clusters
a. younger and contain fewer stars b. younger and contain more stars c. older and contain fewer stars d. older and contain more stars e. more luminous and cooler
The region in which charged particles are trapped by our magnetic fields is the
A) Aurora. B) ozone layers. C) Van Allen radiation belt. D) exosphere. E) ionosphere.