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Watch comet PANSTARRS 'switch on' its second tail as it makes closest approach to Earth

The ion tail appeared as Comet C/2025 R3 PanSTARRS was about 45 million miles from Earth (72 million kilometers) during its ...
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Why do animals have tails?

Dogs use their tails to communicate. Eastimages/Moment via Getty Images Whether they belong to reptiles, insects, birds or mammals, tails serve a wide variety of purposes. Modern animals use their ...