If the two craft were not connected, the satellite above would be traveling slightly more slowly than the shuttle below and would soon fall far behind.

As a satellite travels over the horizon, calls are handed to adjacent spot-beams; this occurs approximately every fifty seconds.

The satellite was travelling with a velocity of about 17,500 mph (around 28,000 km/h or 7.8 km/s).

The forward antenna faces the direction the satellite is traveling.

If it was small enough the satellite could travel a direct course and arrive at Jupiter soon after Galileo's own arrival.

They were not stars, he soon realized, but satellites that orbit the giant planet in much the same way the planets themselves travel around the Sun.

Here, the satellites are in near-polar circular orbits across approximately 180 degrees, travelling north on one side of the Earth, and south on the other.

The satellite travelled at about 29,000 kilometers (18,000 mi) per hour, taking 96.2 minutes to complete each orbit.

The constellation will be situated in a low Earth orbit and the satellites will travel on 6 orbital planes separated by 30 degrees of longitude.

For any given orbit, there is only one speed at which a satellite can travel and remain in that orbit.