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.
Directed by Phil Lord and Christopher Miller, Project Hail Mary stars Ryan Gosling as Ryland Grace, a middle school science teacher who wakes up on a spaceship millions of miles from Earth with no recollection of how he got there. As his memory slowly returns, he pieces together his mission: save Earth from the alien microorganisms causing the sun to die out. Those who have read the book (which I couldn't recommend more — particularly the audiobook) know the gripping story is about a whole lot more than just science. It's a story about survival and unexpected friendship, and you may want to bring some tissues along.
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The Severn Estuary is home to huge numbers of sprats and salmon, and the twaite shad, a protected migrating species which spawns in the tributaries of the River Severn.
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