In 1776, the solar system only had 6 planets. Now, it has 8. Does it end there?
via space.com
Short excerpt below. Read at the original source.
Over the past 250 years, the number of “planets” in our solar system has ranged from six to nine — and, briefly, even 11 — depending on what astronomers knew at the time and how they defined a planet. As the United States prepares to celebrate its 250th anniversary, that changing tally offers a unique […]