What are some (3) similarities between burning ethanol and burning hydrogen fuel?

Which best describes how johannes kepler developed his laws of planetary motion

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

How do scientists think that gravity affected the formation of our solar system?