The biggest planet in our Solar System just got a little smaller. Okay, not physically, but our measurements of Jupiter just got more precise, and it turns out there's slightly less of the giant than we thought. According to the new data, Jupiter's radius measures 71,488 kilometers (44,421 miles) at its equator, and the planet rises 66,842 kilometers from its center to its north pole. That makes it 4 kilometers narrower each side at the equator, and 12 kilometers 'flatter' at each pole, than