Must watch this video to know completely about a comet (धूमकेतु).br Facts of a comet's structureanatomy, revolution around sun, time taken for one revolution, formation & reason behind a comet's tail are so interesting and amazing. br br धूमकेतु के बारे में कुछ महत्वपूर्ण रोचक तथ्य।br br This video also contains interesting facts about Halley's comet.br br For more such interesting and amazing general knowledge please like, share & follow this channel.