Space science
Watching great comets shine brightly in the sky for 18 months
Hale-Bopp comet is 1,000 times brighter than Halley's comet at the time of discovery. The pale blue tailed white tail can even be observed in urban-polluted cities like…
Hale Bopp
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Space science
Comets bring life materials to Earth
Comets have long been attractive to us. In primitive cultures, the mysterious appearance of comets symbolizes divine anger towards humans or an omen of defeat in the war.