a law concerning the speed at which planets travel; a line connecting a planet to the sun will sweep out equal areas in equal times; "Kepler's second law means that a planet's orbital speed changes with its distance from the sun"
a law concerning the speed at which planets travel; a line connecting a planet to the sun will sweep out equal areas in equal times; "Kepler''s second law means that a planet''s orbital speed changes with its distance from the sun"
a law concerning the speed at which planets travel; a line connecting a planet to the sun will sweep out equal areas in equal times