Calcs regarding the destruction of two planets (Star Wars)
Part 1: Kijimi
Requested by u/Due-Imagination3837
In The Rise of Skywalker, the planet Kijimi was the first to be destroyed by the Final Order's Xyston-class Star Destroyers. This is important as I have been informed that it is possible to scale top tier Force users to it (something to do with the crystals IIRC)
The wiki gives Kjimi a diamter of 9874km, so we'll simply use that to measure the distance the debris travelled, which as shown below is 18293.9km.
Since it took, from my count, 277 frames from the start of the explosion to the pictured frame and the frame counter I use goes by 24fps, it 11.5 seconds to go that distance. This gives us a speed of (18293.9 x 1000)/11.5 = 1585031 m/s.
Next up, we'll find the mass of the planet. I'll be assuming it has a comparable density to Earth, which is 5515 kg/m^3. We'll need the radius of the planet in meters for this, which is (9874 x 1000)/2 = 4937000m. Now the volume is 4/3 x pi x 4937000^3 = 5.04055074 x 10^20 m^3 and multiplying by density gives us (5.04055074 x 10^20) x 5515 = 2.77986373 x 10^24kg.
Finally, we are ready to solve for the kinetic energy. Using VSBW's 3D omnidirectional KE for dispersion, we get (1/20) x 2.77986373 x 10^24 x 1585031^2 = 3.49195838 x 10^35 joules or 83.45980824 yottatons (Large Planet Level).
Apparently, I can multiply this by the number of ships for the scaling of high tiers (again, crystal shenanigans IIRC). Taking the official VFX statement that there were 1080 Star Destroyers, that would get us 90.13659289 ronnatons (Dwarf Star Level), but if we take the statement that the fleet was the largest the galaxy had ever known literally, then the wiki states that the Galactic Empire had 25000 Star Destroyers, getting us 2.086495206 quettatons (Dwarf Star Level).
I'll note that these results do differ from the previous calculation done by CornerCornDog, which is probably more precise.
Part 2: Anaxes
While it is never shown on-screen, it is known that the planet Anaxes was reduced to an asteroid field by some unknown catastrophe around 19 BBY. This is important because somehow a species known as the fyrnocks were able to survive and it's really easy for practically anyone to scale to them, so I'm going to see how much energy they might have needed to take.
Since the destruction takes place off-screen, we have to use GBE. According to the wiki, Anaxes no longer has a stated size in Canon, but it does have a diameter of 16100km in Legends sources. I'll use this as a high end (seeing as this is larger than Earth), but since it'll take more work, I'll tackle it first.
GBE requires radius and mass. Radius is easy; the answer is 8050km or 8050000m. Now for mass, we'll first need the volume so we'll plug our radius into the equation we already used for 4/3 x pi x 8050000^3 = 2.18512482 x 10^21 m^3. Using the same density as before gives us a mass of (2.18512482 x 10^21) x 5515 = 1.20509634 x 10^25 kg.
Now for our GBE, frankly I'm just gonna post the screenshot of my calculator because I ain't writing allat, but that makes our high end GBE 7.22420919 x 10^32 joules or 172.66 zettatons (Planet Level) as opposed to the low end of Earth's GBE (59.44 zettatons).
To calc the energy the fyrnocks would have taken, I'm going to do this kinda like calcing the energy taken from an explosion from a distance. First we need to find intensity for which we'll need radius and energy, which we've already got.
Using the size and GBE of Earth, the equation is (59.44 x 10^21)/4pi(6371000^2) = 116534287.9 tons per square meter or 116.5342879 megatons per square meter (Mountain Level). Using the size and GBE of Legends Anaxes, the equation is (172.66 x 10^21)/4pi(8050000^2) = 212026484.1 per square meter or 212.0264841 megatons per square meter (Mountain Level).
Not sure how usable this should be considered, but it would be a major upgrade for low tier Star Wars.
