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The answer is D inside Jupiter's orbit. They usually form at 1.5 to 2 AU from the sun. Comets can have two tails - a dust tail that points backward along the comets trajectory and an ionized gas trail that points away from the sun.

1) True 2) True 3) True but there is a quibble. What is true is that close to the surface of the moon the acceleration of a dropped object is about 1.6 meters per second, which is about one sixth of the equivalent 9.8 meters per second near to the surface of the earth. However the moon has only...

1) True 2) True 3) True but there is a quibble. What is true is that close to the surface of the moon the acceleration of a dropped object is about 1.6 meters per second, which is about one sixth of the equivalent 9.8 meters per second near to the surface of the earth. However the moon has only...