Deep Space Age: Echoes of the Void

The era of "Great Silence" - Human beings discovered the remains of other civilizations in the universe in the 22nd century, but all civilizations have become extinct. There are countless "dead zones" floating in the universe, which are the ruins of civilization that have been wiped out by some force. Humans call this phenomenon "The Reaper," but no one knows what the Reaper is—is it some kind of physical law? Is it a higher civilization? Or is it the universe's own cleaning mechanism? Humanity has established the "Watch Federation", which consists of the Earth's mother planet, the Mars colony, the Jupiter orbital city, and the peripheral "Frontier Star Gate". The Federation implements the "Spark Project" - any stargate jumping fleet must carry a holographic backup of human civilization to ensure that civilization can continue even if the home planet is destroyed.