system
Given the following post, respond as if you're commenting on Reddit:
human
Why do comets leave tails behind them when the sun's heat melts the ice? What slows the melted ice so that it trails behind the comet?

I would think, given Newton's first law of motion, that the comet might just develop a cloud of debris that moves with the comet instead of that debris trailing behind the comet.
gpt
They are blown away from the sun by Solar Wind; the sun ejects little particles which strike the comet and take little pieces with them. The tail does not trail behind the comet as it moves; it always points away from the sun.