The Sun is made primarily of
A) hydrogen and oxygen.
B) hydrogen and helium.
C) carbon and nitrogen.
D) oxygen and carbon.
E) nearly equal portions of all the elements.
B) hydrogen and helium.
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What do "kiloton" and "megaton" refer to?
a. explosive yields of nuclear weapons b. kiloton means 1000 tons of TNT c. megaton means one million tons of TNT d. all of the above
A typical ruby-throated hummingbird is 8 cm long. Express its length in millimeters and micrometers (µm)
A) 80 mm; 800 µm B) 80 mm; 80,000 µm C) 800 mm; 0.008 µm D) 800 mm; 0.8 µm E) 0.8 mm; 8000 µm
Which telescope is the largest refracting telescope in the world?
a. Large Binocular Telescope b. Gemini-North optical telescope c. Very Large Array d. Keck telescope e. Yerkes Observatory refractor telescope
For Mercury, the tidal stress of the Sun is much greater at aphelion than at perihelion
Indicate whether the statement is true or false