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The major axis of a comet's orbit is the longest diameter of its elliptical orbit. Given that Halley's comet has a major axis of approximately 35.1 AU (Astronomical Units), or about 5.25 x 10^12 cm, scaling it down to 15 cm would result in a significant reduction in size. To determine the new distance between the foci, we can use the formula for the distance between the foci of an ellipse, which is 2a - 2c, where "a" is half the length of the major axis and "c" is the distance from the center to each focus. With the major axis scaled down to 15 cm, we would have a new major axis of 15 cm / (5.25 x 10^12 cm) = 2.86 x 10^-12 times the original size. Therefore, the distance between the foci would also be scaled down by the same factor, resulting in a new distance of approximately 5.7 x 10^-12 cm.

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