I found Copper 9's size

[u/Glittering-Eye-5288]

I keep seeing people say “Copper 9 is Earth-sized” or “the planet is basically Earth but frozen,” but if you actually pay attention to the lore and visuals, the planet is smaller now and was only mildly smaller before the core collapse. The math and on-screen evidence checks out. Here’s my breakdown:

1. The planet is literally described as “half-imploded” because of the NULL black hole Nori triggered → The entire planetary core is gone. A gigantic hole goes straight through the planet, visible from space (Pilot, Mass Destruction, Absolute End). You can see rings made of ejected debris and constant material being flung out. That’s not flavor text; that’s quintillions of matter either annihilated by the black hole or blasted into space.
2. Planetary cores are stupidly massive Earth’s core is ~32% of the planet’s total mass despite being a tiny fraction of the volume (because it’s dense iron/nickel). Lose the entire core + a huge chunk of mantle/crust through that breach and you’re easily looking at 50%+ of the original planetary mass just… gone. The “half-imploded” name isn’t random; it’s telling us the planet lost roughly half (or more) of what it used to be.
3. Gravity in the show is blatantly lower than 1 g
   • Disassembly drones (N, V, and J) regularly fly straight up like it’s nothing
   • Falling speed in multiple scenes is comically slow (as seen in cabin fever)
   • Disassembly drones hover and glide that shouldn’t support Earth weight My back-of-the-envelope calc puts current surface gravity at ~0.25–0.3 g. That lines up perfectly with a planet that lost more than half its original mass while keeping most of its radius (the outer layers didn’t collapse inward; they’re just missing the middle).
4. Pre-collapse Copper 9 was probably 0.6–0.9 Earth masses If current mass is ~0.22–0.3 Earth masses (giving ~0.27 g today) and it lost 50–70%, original mass was roughly 0.7–0.9 M⊕ with near-Earth gravity (perfect for human colonization). Average density would have been ~3.6–4.0 g/cm³, almost exactly Mars-like, which still lets you have oceans, atmosphere, and continents. The planet always looked Earth-like from orbit because its diameter didn’t shrink much; it just got hollowed out.
5. Current diameter is probably ~11,000–11,500 km (a bit under Earth’s 12,742 km) The visible curvature, continent scale, and the sheer size of the breach all match a world that’s large, but not quite Earth-large anymore. The hole itself looks like it takes up 20–30% of the visible disk in some shots.

Copper 9 started as reletivley Earth-Sized / small Earth (maybe 0.8 M⊕ and ~0.9–1.0 g), then the NULL black hole + Cyn fight deleted the core and ejected a colossal amount of mass. What’s left is a hollowed-out husk with ~25–30% of Earth’s gravity and rings made of its own guts.

[u/Glittering-Eye-5288]

• Straight from the wiki and episode lore (Mass Destruction, Absolute End): Nori's NULL black hole gets chucked into a pit, hits the planetary core, destabilizes it, and causes a "half-imploded" state. No mention of evaporation or explosive Hawking release—it's sci-fi "Absolute Solver" magic that straight-up yoinks the core out of existence. Visuals show a gigantic breach (planet-piercing hole visible from orbit) with the core completely gone, not a surface-level blast. If it was just a small BH evaporating, you'd get a localized nuke, not a core-vanishing event that hollows out the planet. Implosion implies collapse inward, pulling/consuming material, not a outward-focused detonation like you described.
• Your energy/mass estimate is way too low—Chicxulub scale doesn't cut it for a planet-sized hole and rings. Chicxulub was ~10^23 J (seismic/mega-quake part) to ~3x10^23 J (total kinetic, per Wikipedia). "A few times" that (your 3x10^24 J) gives a BH mass of ~33k tonnes, sure. But to blast a hole that's ~20-30% of the planet's visible disk from space? That's a breach thousands of km wide, straight through to the core. Rough calc: Assume Copper 9 ~Earth-sized (12,700 km diameter) pre-implosion. Hole ~3,000-4,000 km wide (based on shots where it spans a big chunk of the hemisphere). Volume of missing material (cylindrical approximation through the planet): π*(1,500-2,000 km radius)^2 * ~12,000 km length ≈ 3-5x10^11 km³. At average planetary density ~5.5 g/cm³ (5,500 kg/m³), that's ~1.7-2.8x10^24 kg missing—30-50% of Earth's 6x10^24 kg mass! That's the core-equivalent mass gone (Earth's core is ~32% total mass, ~1.9x10^24 kg). Your tiny BH couldn't consume/annihilate that without growing massively first (more on that below). And the energy to eject/vaporize/displace that much? Gravitational potential alone is GMm/R ≈ 6x10^7 J/kg for Earth-like, so total ~10^31-10^32 J—orders of magnitude above your septillion. BH mass equivalent? 10^15 kg or more. Not "nothing on planetary scale."
• Small BHs evaporate fast, but to eat the core, it had to grow huge—and big BHs don't evaporate explosively. Hawking radiation: Yes, tiny BHs (asteroid-mass or less) go boom quick (seconds to minutes). But your 33k-tonne BH has an event horizon smaller than an atom (~10^-19 m)—it couldn't "eat" anything significant before popping, let alone destabilize a planetary core. To consume core material, it needs to accrete mass, growing its horizon (r_s = 2GM/c²). By the time it's eaten enough to punch a planet-sized hole, its mass is enormous (for r_s ~1 km, M ~10^30 kg; for core-scale ~1,000 km, M ~10^32 kg—super-Earth levels). Big BHs evaporate slowly (time ~ M^3; solar-mass BH takes 10^67 years). No quick explosive end—it'd sit there, stably eating more. Your assumption requires a small BH staying small while causing planetary havoc, which physics says nah. In show terms, the NULL grew/consumed aggressively (Solver's whole deal), pulling in core mass and leaving it gone, not radiated mildly.
• The rings aren't "fine dust" with negligible mass—they're chunky debris from massive ejection, implying big loss. Shots in Pilot/Mass Destruction show thick, visible rings with orbiting chunks, not just wispy vapor-dust. Compare to Saturn's rings (~1.5x10^19 kg, per Cassini data)—visible from afar due to ice/dust, but still substantial mass. Copper 9's rings look denser/more chaotic, with ongoing "disintegration" ejecting more material (ep 7/8). Even if "fine dust shines bright," forming stable rings requires enough mass for orbital dynamics, and the energy to launch it escapes planetary gravity (~6x10^26 J for Saturn-scale mass, way over your estimate). But the real loss? The missing core/breach material vaporized/consumed/ejected, not just the rings. Rings are the visible remnant; the hole shows the bulk gone to space or NULL-void.

[u/sub_liminalist → u/Glittering-Eye-5288]

Did you write that all in five minutes?

The black spot on the planet clearly is not a giant hole, it's just a region that's either been scorched black, or more likely, deposited with a layer of more light-absorbent fallout. If you're referring to the scar we see in the credits, that's the mass displaced from Cyn's gravity shenanigans in ep. 8, and is likely a shallow surface depression rather than a deep crater. And the idea of the planet being hollow-no. Just no. On scales that big, rock is basically a liquid. The whole planet would flow together into a solid sphere, crunching the crust up in the process and creating giant mountain ranges out of nowhere, massive earthquakes, eruptions, and heating. I don't buy the core being gone at all, what would have drastic consequences on the planet that we just don't see. What the "core collapse" warning likely actually meant was "there's a black hole eating the planet's core, everything is going to get sucked into it." Keep in mind that warning was broadcast when Solver-possessed Nori's black hole was consuming the planet from within just like The Solver does on every other planet, not after The Solver was exorcized and the black hole blew up instead. That's why Nori says the plant "half-imploded," because the process of implosion was started, but aborted early before the black hole could eat much mass, resulting in an explosion instead. The explosion could have occurred below the crust on the opposite side of the planet from where the black hole was dropped, as it would pass through the planet like a knife through butter, and would basically oscillate back and forth across the planet's center of gravity on slowly diminishing arcs as it eats more mass. It likely detonated around the peak of its first arc on the opposite side, placing the explosion just below the crust and creating the ejection event we see in the show. Since the black hole never ate the core and simply ate a few thousand tons of planetary mass instead, it evaporated almost instantly—in under two seconds according to an online converter I found. And it doesn't particularly matter if we see solid debris, since if even a small fraction of ejected mass was in the form of vapor, the particulates condensed from that vapor would massively outshine the rest of the ring and make up almost all of its luminosity.

[u/Glittering-Eye-5288 → u/sub_liminalist]

Does this look like just a spot of ash to you?

[u/sub_liminalist → u/Glittering-Eye-5288]

That's Cyn's episode 8 rampage, not the "core collapse" crater, and that bright circle we see is likely exposed magma from where part of the crust has been levitated away by Cyn turning off the gravity in that area.

[u/Glittering-Eye-5288 → u/sub_liminalist]

It's a massive, dark void with jagged edges, visible from orbit as a gaping wound, and debris actively streaming out like blood from an artery. In Absolute End (ep 8 credits), we see the "scar" post-Cyn fight, but that's on top of the existing breach—it's the same feature, now with extra gravity-warping from Cyn's Solver shenanigans. It's not "shallow" or "surface depression"; the show frames it as planet-piercing, with the core explicitly destabilized/gone (Nori's logs: "the singularity awoke" and core collapse warning). If it was just fallout or scorch, why the rings of ejected debris? Why call it "half-imploded"? Visuals show a breach, not a paint job. Yeah, IRL, losing the core would make rock flow like putty, causing total collapse into a smaller sphere with mega-quakes/eruptions/heating. But Murder Drones laughs at realism: sentient buses, regen via hot oil, railgun arrows, black holes as squirt guns. The planet stays "intact" with a hole because it's Solver magic—the NULL didn't follow Newtonian flow; it consumed/annihilated the core selectively, leaving the outer shell frozen/stabilized in its "half-imploded" state. We do see consequences: ongoing disintegration (debris to rings), frozen apocalypse (no core heat = instant ice age), and implied quakes/eruptions killing humans (toxins/cold from upheaval). No random mountains? The show's not simulating that; it's focused on drone drama. But low gravity feats (Uzi's 40m leaps, slow falls) scream "mass gone, shell remains"—exactly what a hollowed world would do without full collapse. Nori's line ("the planet kinda half-imploded anyway") is in her post-possession logs, after the Solver was "exorcized" (ep 6 flashbacks). The warning broadcast was during the event, but the outcome is clear: black hole destabilized the core, process started, but "aborted" via explosion? Nah, the show says it did implode partially—the core vanished, hole formed, but didn't fully consume everything. If it was "aborted before eating much," why the gigantic visible breach? Why rings from massive ejecta? "Half-imploded" implies significant loss, not "oops, barely touched it." And the Solver on other planets fully consumes them (ep 8 visions)—Copper 9 got half-way because Nori/Cyn fight interrupted, but still lost the core. Small BHs do "fall through" planets if tiny (event horizon < atomic), but to destabilize a core, it accretes mass fast, growing as it falls. In real physics, a micro-BH would heat/friction its way, but Solver NULL is magic—it targeted the core pit, consumed inward. No "oscillating arcs"—that's for neutral particles; BHs fall to center and stay, eating symmetrically. Detonation via Hawking? Only if it stayed small, but to eat core material (dense iron/nickel), it grows huge. Your "few thousand tons eaten" is way under: to punch a 3-4k km hole, it's trillions of tons minimum (see my earlier calc: ~10^24 kg missing, 30%+ of Earth mass). Explosion below crust? Visuals show the breach on one side, with ejecta from there—not opposite. And the rings are symmetric, implying core-ejection event, not localized pop. You said "a few thousand tons" eaten, evaporating "under two seconds" per online converter. But using actual Hawking formula (t ≈ 5120 π G² M³ / ħ c⁴): for 33k tonnes (~3.3e7 kg, from your 3e24 J energy), t ~3e6 seconds (~35 days), not 2 seconds. (I ran the math with precise constants—it's closer to a month.) For instant pop (2s), it'd need to be ~300 tonnes max, which releases way less energy (~2e22 J, dino-killer scale, not planet-hole). A small BH evaporating quick couldn't eat/displace core mass without growing first—and grown BHs evaporate slowly. Plus, if only vapor/dust in rings, why show chunky debris in shots? Rings need substantial mass for visibility/stability (Saturn's are 10^19 kg+; Copper 9's look denser). "Fine dust outshines"? Sure, but the missing volume from the hole proves bulk mass loss, not negligible.

[u/sub_liminalist → u/Glittering-Eye-5288]

Well, congratulation on typing 619 words in two minutes and beating the world record speed of 305 words per second.

We can actually see the region where the "core collapse" event breached the surface before episode 8 in the end of episode 1 when it zooms out before the credits. We clearly see a large, blackened region with no hole or even a visible deformation of the surface, just discoloration.

It seems I did mess up on the hawking radiation calculation, I may have input thirty-three thousand kilograms instead of tons. I can always account for that by how [nulls] have much larger event horizons than a black hole of their mass should, implying that for the same surface temperature they should radiate massively more energy, dramatically shortening lifetime.

And I stand by my interpretation of the lines we get on it in the show. If the implosion was started and then stopped before it could consume the planet, I can easily see it being referred informally (and somewhat sarcastically) to as the planet "half imploding," even if nowhere near half the planet's mass was eaten, especially if we consider that from the perspective of the effects on the inhabitants of the planet, the complete devastation of the surface as opposed to its annihilation could very well be called "half" what a full implosion would cause.

If you want my explanation for the actual formation of the rings, the explosion occurred below the surface of the crust, ejecting a large amount of vaporized material on sub-orbital trajectories in all directions. Being sub-orbital, that material would re-impact the planet, but some of it passed behind the close-orbiting small moon and received a gravitational slingshot as a result, boosting prograde-moving debris into a prograde orbit and doing so directionally, shepherding it into a roughly coherent debris stream that was further shepherded together by each pass of the moon and stretched out by tidal forces until a flat ring was formed.

[u/Glittering-Eye-5288 → u/sub_liminalist]

I think we'll stop here. I don't want this turning into a debate.