41. After the Moon, what is the brightest natural object in the night sky, reaching an apparent magnitude of −4.6, bright enough to cast shadows?
42. According to the standard model of Big Bang cosmology, approximately how old is the Universe?
43. What word, which derives from a Greek term meaning "unequal" or "bent," describes a triangle whose three sides are of unequal length?
44. Over half of the world's supply of what element, which gets its name from the epithet of the Greek goddess Athena, is used in catalytic converters?
45. In quantum mechanics, the physical constant used to describe the sizes of quanta – denoted as h – is named after what German physicist?
46. Approximately how long does it take light from the sun to reach Earth?
47. In meteorology, what does the suffix -nimbus added to the name of a cloud indicate?
48. What element, which has the atomic number 16 and is a bright yellow crystalline solid at room temperature, is referred to in the Bible as "brimstone"?
49. The moons Io, Europa, Ganymede, and Callisto all orbit what planet?
50. What unit of measurement, which is equal to 33,000 foot-pounds per minute, did 18th-century steam engine entrepreneur James Watt come up with?