The scientific discipline of astrobiology is
A) one of the oldest branches of science
B) a relatively young branch of science
C) a similar age to other fundamental disciplines like physics and chemistry
D) a hypothetical branch of science which has yet to be established
B
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How fast does light travel from Proxima Centuri to Earth?
a. 4.2 ly b. 4.2 years c. 3 × 10^8 m/s d. None of the other choices are correct.
Suppose a scientist holds a press conference at which he claims that 10% of the matter in the Milky Way is in the form of dust grains. Does his claim seem reasonable? Why or why not?
A) The 10% figure is too high because there are not enough heavy elements to make that much dust. B) It is reasonable because we already know that interstellar dust obscures our view through the disk of the galaxy. C) The 10% figure is too low because most of the mass of the galaxy is in the form of interstellar dust. D) It seems reasonable as long as we assume that red giant stars, which produce dust grains in their stellar winds, are more common than we thought.
The energy per unit charge supplied by a battery is its
a. voltage. b. current. c. resistance. d. electric field. e. critical temperature.
Most photosynthesis takes place
a)when animals breathe. b)in tropical forests. c)in the oceans. d)in the atmosphere.