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Anti-satellite weapons (ASAT) are space weapons designed to incapacitate or destroy satellites for strategic or tactical purposes. Although no ASAT system...

The Tychonic system (or Tychonian system) is a model of the universe published by Tycho Brahe in the late 16th century, which combines what he saw as the...

Interstellar communication is the transmission of signals between planetary systems. Sending interstellar messages is potentially much easier than interstellar...

Cosmic pluralism, the plurality of worlds, or simply pluralism, describes the belief in numerous "worlds" (planets, dwarf planets or natural satellites)...