According to Kepler's Laws, Halley's Comet Circles the Sun in an Elliptical

Multiple Choice

According to Kepler's laws, Halley's Comet circles the Sun in an elliptical path with the Sun at one focus of the ellipse. What is it that Kepler's laws indicate is at the other focus of the ellipse?

A) nothing
B) the Earth
C) The comet itself passes through the other focus.
D) The tail of the comet stays at the other focus.