According to current understanding, if the universe continues to expand forever, the last major source of light will come from
A) evaporation of black holes.
B) the last supernovas.
C) collisions between galaxies.
D) gamma-ray bursts.
A) evaporation of black holes.
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Which of the following is an example of a star?
A) Venus B) Pluto C) The Sun D) The Moon
Carbon-14 dating can reliably date ancient archeological samples up to approximately how many years?
A) 100 million B) 50 thousand C) 5 million D) 10 billion E) 5 thousand
Which jovian planet has the most extreme seasonal changes, and why?
A) Uranus, because of its extreme axis tilt B) Jupiter, because of its large mass C) Saturn, because it has an axis tilt similar to Earth D) Neptune, because of its varying distance from the Sun
According to present theories, there is a neutrino for all the following particles except
a. the neutral pion. b. the electron. c. the muon. d. the tau lepton.