Except for Io, the other three Galilean satellites have periods of rotation and revolution that are ________.
Fill in the blank(s) with correct word
Question 2
Which of the following is NOT a property of a pulsar?
A) period of 1.34 seconds
B) over time, the period is gradually increasing
C) emissions only in the visible part of the spectrum
D) each pulse consisting of a 0.01 second burst of radiation
E) time interval between pulses is very uniform