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"Halleyâ€™s comet", type: Website
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Primary and secondary information on comets and observing comets, including news, observations, orbital data, designation and links to other sites.
Complex molecules like proteins could have been formed by comets impacting on Earth.
The history of the first comet discovered using a telescope.
A page of information about this famous comet.
Some images and information on this comet.
Frequently Asked Questions about Comets answered by astronomer Dr. Cathy Imhoff of the Space Telescope Science Institute.
Read how comets behave in the solar wind and why comets have two tails.
The difference between a comet, asteroid and meteorite neatly explained in this infographic.
A brief description of how Comets work from HowStuffWorks.com.
A page from the UK space agency on this famous astonomer - the first man to predict the return of a comet.
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