Kepler demonstrated that as a planet revolves around the sun: its speed and distance changes its speed changes its distance changes its distance is constant

its speed and distance changes

Explanation:

Johannes Kepler who was widely known for his astronomical works demonstrated that as a planet revolves around the sun: "its speed and distance changes."

This is evident in Kepler's law which through Brahe's astronomical observation states that as planets revolve around the sun, the planets pushed faster when they were closer to the Sun, compared to when they move away from the Sun.

Therefore, the planet's speed and distance change.

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donald carl johanson (born june 28, 1943) is an american paleoanthropologist. he is known for discovering – with yves coppens and maurice taieb – the fossil of a female hominin australopithecine known as "lucy" in the afar triangle region of hadar, ethiopia.

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