• Dusty or gassy material trailed from a comet in the inner solar system under the influence of solar radiation. A comet tail is only slightly denser than deep space itself, and shines by reflection of sunlight from dusty material and by the fluorescence of gas molecules. The dusty and gassy types of tail often separate out as forces of differing strength and type act on them.
  • The rear, bottom, or lowest part of something.
  • A small pulse that follows, and is in the same direction as the main pulse that produced it.
  • A brief signal that remains after the actuating signal is removed. For example, a brief signal emitted by a transmitter after talking has stopped.
  • synonym trailing edge

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