Well, today marked a strange occurance in the world of science that saw the amount of planets in our solar system revised down to 8!
It seems like a small thing bacause it doesn’t really affect our everyday lives, but somehow I feel like reality has changed. All my life, I’ve been taught that there are 9 planets, but now Pluto will no longer carry that designation. Kids growing up now will get new text books in the near future where the new rules will be the norm making our adult pasts seem that much more ignorant, quaint and misguided.
Again, I don’t really know why this is weighing on my mind so much, but I would at least like to remember this day for future reference should I ever have kids I can tell them the very day their solar system got a little more cozy.
From the AP:
For now, membership [of the planets] will be restricted to the eight ”classical” planets in the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Much-maligned Pluto doesn’t make the grade under the new rules for a planet: ”a celestial body that is in orbit around the sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a … nearly round shape, and has cleared the neighborhood around its orbit.”
Pluto is automatically disqualified because its oblong orbit overlaps with Neptune’s.
Instead, it will be reclassified in a new category of ”dwarf planets,” similar to what long have been termed ”minor planets.” The definition also lays out a third class of lesser objects that orbit the sun — ”small solar system bodies,” a term that will apply to numerous asteroids, comets and other natural satellites.
Photograph of the IAU’s Richard Binze, Christopher Corbally and Jocelyn Bell-Burnell by Petr David Josek/AP