One reason for routinely launching GPS satellites is simply "constellation replenishment," said Col. Andrew Menschner, deputy commander of the Space Force's Space Systems Command. Old satellites degrade and die, and new ones need to go up and replace them. At least 24 GPS satellites are needed for global coverage, and having additional satellites in the fleet can improve navigation precision. Today, there are 31 GPS satellites in operational service, flying more than 12,000 miles (20,000 kilometers) above the Earth.
Because of strict rules around the length of time child actors are able to work, and the fact she is 5ft (1.5m) tall, London tells Newsbeat she is often asked to stand in for them.
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Welcome to your guide to Pips, the latest game in the New York Times catalogue.
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