None of Planet Jupiter's four bright moons, which ordinarily may be scanned by a $5 or $10 telescope, was visible from the U. S. one evening last week. That was a rare coincidence which had not happened since May 10, 1914 and will not happen again until July 16, 1939.
Jupiter, largest of the Sun's nine planets and heavier than all the other eight planets combined, has nine satellites. Large astronomical telescopes have difficulty in discerning five of them. Two others are each as big as Earth's Moon. The two remaining are each half as large again. They surpass Planet Mercury in...
To continue reading:
or
Log-In
