? star has a radius similar to that of the Sun but half the Sun’s luminosity. What is the surface temperature of this star using this data?
a.
0.84 TSun
b.
0.43 TSun
c.
1.2 TSun
d.
2.4 TSun
A
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Spheres are an essential part of Kepler's three fundamental rules of planetary motion
a. True b. False Indicate whether the statement is true or false
Why do terrestrial planet cores contain mostly metal?
A) The entire planets are made mostly of metal. B) Metals condensed first in the solar nebula and the rocks then accreted around them. C) Metals are denser than rocks, so they sank to the center when the interiors were molten. D) Radioactivity created metals in the core from the decay of uranium. E) Convection in the mantle carried the metals to the core.
The Kuiper Belt is found where in the solar system?
A) among the orbits of the terrestrial planets B) beyond the orbit of Neptune C) between the orbits of Mars and Jupiter D) between the orbits of Jupiter and Uranus E) sixty degrees ahead of or behind Jupiter
For which of the values below is x > x3?
a. x = -1.5 c. x = 1.0 b. x = 0 d. x = 1.5