Like our own moon, many Jovian moons exhibit what is called synchronous rotation. This means that they rotate at the same rate
A) that their host planet rotates
B) as all other moons around the host planet
C) that the host planet orbits about the Sun
D) that they orbit their host planet
Question 2
The total number of galaxies in our observable universe is
A) about ten million
B) about a hundred billion
C) infinite
D) a few trillion