A curved shock wave that forms when the solar wind encounters an obstacle like a planet's magnetosphere or when a star moves through the interstellar medium. It resembles the wake created by a boat moving through water.
Named by analogy to the bow wave created by a ship moving through water. The astronomical usage developed in the 1960s when spacecraft first detected these shock formations around planets and later when astronomers observed them around fast-moving stars.
Earth's bow shock is like a cosmic snowplow, located about 90,000 kilometers ahead of our planet, deflecting the solar wind around our protective magnetic field! Some fast-moving stars create spectacular bow shocks as they plow through space - these cosmic bullets can create glowing shock waves visible in infrared light stretching for light-years.
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