this post was submitted on 05 Oct 2024
274 points (93.1% liked)

Showerthoughts

29625 readers
1274 users here now

A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.

Rules

  1. All posts must be showerthoughts
  2. The entire showerthought must be in the title
  3. Avoid politics (NEW RULE as of 5 Nov 2024, trying it out)
  4. Posts must be original/unique
  5. Adhere to Lemmy's Code of Conduct

founded 1 year ago
MODERATORS
 

It was only in 1969 (nice) that fungi officially became its own separate kingdom.

you are viewing a single comment's thread
view the rest of the comments
[–] CheeseNoodle@lemmy.world 3 points 1 month ago (1 children)

Actually planet doesn't have any hard set definition, we kind of just do it case by case because its damn near impossible to come up with a rigid definition that doesn't suddenly classify some planets as moons or some moons as planets or create weird situations in which an object can switch between the two.

[–] wanderer@lemmy.world 4 points 1 month ago (1 children)

The International Astronomical Union (IAU) defined in August 2006 that, in the Solar System, a planet is a celestial body that:

  1. is in orbit around the Sun,
  2. has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and
  3. has "cleared the neighbourhood" around its orbit.

https://en.wikipedia.org/wiki/IAU_definition_of_planet

[–] CheeseNoodle@lemmy.world 5 points 1 month ago (1 children)

And in that same article:

It has been argued that the definition is problematic because it depends on the location of the body: if a Mars-sized body were discovered in the inner Oort cloud, it would not have enough mass to clear out a neighbourhood that size and meet criterion 3. The requirement for hydrostatic equilibrium (criterion 2) is also universally treated loosely as simply a requirement for roundedness; Mercury is not actually in hydrostatic equilibrium, but is explicitly included by the IAU definition as a planet

[–] Draconic_NEO@lemmy.world 2 points 1 month ago

That's not even addressing the issue of rogue planets which were ejected from their star system. Many estimates say they outnumber the stars. Obviously when a planet is ejected it doesn't just disintegrate but by that poor definition it's no longer a ""planet"", so it's clearly a problematic definition.