Our Solar System and the Pluto Problem
From lecture 3 in professor Charles Bailyn’s ASTR 160: Frontiers and Controversies in Astrophysics:
Bailyn first reminds us of the scientific method and that astronomy is an observational science. He then talks about classification and the six categories of objects in the Solar System:
Sun (a star). Inner, sometimes called terrestial or rocky, planets. Asteroids. Outer, also known as Jovian, planets. Trans-Neptunian, or Kuiper Belt, objects. _Comets in the outer region, or Oort cloud.