In ancient times, comets were often considered signs or omens of future events, True, Comet Halley was shown in the Bayeux Tapestry, which depicts the Norman invasion of the British Isles, True, Comets are made almost entirely of rock and metal, just like most asteroids, False, Comets contain frozen substances such as water, carbon dioxide, methane and ammonia, True, When a comet is far from the Sun, it is generally a cold and inactive object, True, Sublimation is the process in which ice changes directly into gas, True, The solid central part of a comet is called the coma, False, The coma is a cloud of gas surrounding the comet's nucleus, True, A comet's gas and dust always form exactly the same type of tail, False, The ion tail is strongly affected by the solar wind and normally points away from the Sun, True, The dust tail is generally influenced by sunlight and tends to lag behind the comet, True, The tail of a comet is extremely dense compared with the air we breathe, False, In 1910, Earth passed through the tail of Comet Halley, True, Short-period comets have orbital periods of more than 200 years, False, Long-period comets can have orbits that are tilted in many different directions, True, Comets gradually lose mass when they approach the Sun and release gas and dust, True, The Oort Cloud and the Kuiper Belt are possible distant reservoirs of cometary bodies, True, The Rosetta mission was the first human mission to place a probe in orbit around a comet, True, The nucleus of Comet Halley was found to be extremely bright, reflecting almost all the sunlight that hit it, False, Scientists have found organic molecules, including amino acids, in material collected from a comet, True

True / False – Comets

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