What is a Comet ? How big is a comet nucleus ? Where do comets come from ? How do comets become visible from time to time? What is the shape of the path of a comet ? What happens when a comet nucleus races towards the sun? How can we distinguish a dust tail from a gas tail? How many comets are seen every year ? What is the life time of a comet ? What is the difference between a comet and a shooting star ? What is the difference between comets and asteroids ? Why are spacecrafts sent to study comets ? Can comets collide with the earth ? What will happen if a comet strikes the earth directly ? Why do scientists study comets ? How are comets named ? Who are the amateur astronomers who have discovered many comets ? Why were comets feared in the past ? Are there any ancient references to comets in India ? Who was the first person to measure distances to comets ? When did it become possible to predict the appearance of comets ? Why is Comet Hale - Bopp so special ? Can comets be photographed without a telescope ?
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