The conclusions in steps 1 to 4 are called intermediate conclusions, while the conclusion in step 5 is the main conclusion. It is not easily articulated, and is not stated in any language. All planets move on ellipses. Pluto is a planet. Therefore, Pluto moves on an ellipse.
Mercury moves on an ellipse.
Venus moves on an ellipse. Earth moves on an ellipse. Mars moves on an ellipse. Jupiter moves on an ellipse. Saturn moves on an ellipse.