Over a century passed before the discovery of the second natural satellite, called Nereid.

The United States launched their first satellite, called Explorer 1 on January 31, 1958.

It was the second time that the 2,732-pound satellite, formerly called Westar-6, was launched into space.

Also aboard were three smaller satellites called CubeSats designed and built by university and college students.

Both systems might be helped by a swarm of new early-warning satellites called 'brilliant eyes'.

The network is provided by Inmarsat and uses three geostationary satellites called I-4 to provide almost global coverage.

The rocket was to send a satellite, called "Kwangmyŏngsŏng-3", into orbit.

It is now known that the satellite, called Polyot, was in fact a prototype orbital carrier rocket for an antisatellite system.

One of the projects he directed was the ground-breaking Canadian satellite called Alouette.

The satellite, called Ulysses, is being sent to study the Sun.