A Type II supernova produces a planetary nebula
a. True
b. False
Indicate whether the statement is true or false
False
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Which of these Galilean satellites is most geologically active?
a. Io b. Europa c. Callisto d. Ganymede
The thermal conductivity of aluminum is twice that of brass. Two rods (one aluminum and the other brass) of the same length and cross-sectional area are joined together end to end
The free end of the brass rod is maintained at 0°C and the free end of the aluminum rod is maintained at 200°C. If no heat escapes from the sides of the rods, what is the temperature at the place where the two rods are joined together? A) 76°C B) 133°C C) 148°C D) 155°C
Why did Ptolemy have the planets orbiting Earth on "circles upon circles" in his model of the universe?
A) to properly account for the varying distances of the planets from Earth B) to explain why Venus goes through phases as seen from Earth C) to explain why the Greeks were unable to detect stellar parallax D) to explain the fact that planets sometimes appear to move westward, rather than eastward, relative to the stars in our sky E) to explain why more distant planets take longer to make a circuit through the constellations of the zodiac
_____________, or dried seas of dark basalt, are only seen on the near side of the Moon, the side that faces Earth
Fill in the blank(s) with correct word