Which of these is the correct definition for an ellipse?
A) Each point on the ellipse lies on a smooth oval curve around one fixed point.
B) Each pair of points on the ellipse is the same distance from one fixed point.
C) The sum of the distances of a point on the ellipse from two fixed points is the same, for each point on the ellipse.
D) Each point on the ellipse is the same distance from one fixed point.
E) All points on the ellipse are an equal distance apart.
Question 2
How did Galileo know that the planets go around the sun rather than around Earth?
A) From telescopic observations of the phases of Venus as it moves around the sun.
B) From telescopic measurements of the positions of the stars as Earth moved around the sun during the course of one year.
C) From the writings of Aristarchus, the ancient Greek astronomer.
D) By noting that Venus always lies near the sun, as seen from Earth, from which he concluded that Venus must be orbiting the sun.
E) From measurements of the tides raised by the moon as compared with the tides raised by the sun.
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