Do all planets have a perihelion and an aphelion. What are they?
All of the planets in our Solar System move around the Sun in elliptical orbits. An ellipse is a shape that can be thought of as a “stretched out” circle or an oval. The Sun is not at the center of the ellipse, as it would be if the orbit were circular. Instead, the Sun is at one of two points called “foci” (which is the plural form of “focus”) that are offset from the center. This means that each planet moves closer towards and further away from the Sun during the course of each orbit. The point in the orbit where the planet is closest to the Sun is called “perihelion”. The point where the planet is furthest from the Sun is called “aphelion”.
