I mean when you think that you also get wish at this level, it's not that powerful.

RAW they are in fact magical damage. making them count as mundane damage would be homebrew. Check Sage Advice.

i did and you are correct. i have deleted my previus statement

Plus it's magic. It's not allows going to follow conventional rules. This spell allows you to make massive meteors out of nothing but a spell slot that you regain on a long rest. Logic is out the door!

this is the best 9th level spell besides wish,don't you WISH you had it!

PK STAR STOOOOORM!!

"orbs of fire plummet to the ground"

From where?  Is there a minimum amount of clearance needed?  My DM is ruling that this can be cast only under an open sky, which kind of made sense when we weren't wandering through the caverns of Pandemonium.

This sounds more as your house rule for this particular spell. Since nowhere in the spell description says the clause that "Creatures killed by this spell can only be resurrected by True Resurrection". Although I can see the logic behind it (Meteors crashing unto bags of flesh and bone, makes sense). But, your comparison based on that between those two spells is kinda flawed.

This is a saving throw spell, with a major saving this score, that you can't use until level 17. Fire also is one of the damage types a lot of high level enemies have resistance or even immunity to. Most enemies worth using this spellslot on would have a high dex or legendary resistances, so realistically, this spell would only deal 10d6 magical bludgeoning damage to such a creature. 

Now if you were an Order of Scribes Wizard who changed the damage type, then we can talk about a spell dealing rediculous damage.

Well the spell is really just summoning the meteors the meteors themself aren’t magical

Fireball+++++++++

An overchanneling evocation Wizard will deal 240 damage with this spell. Dear god.

edit: I now release you can’t overchannel meteor swarm

You're summoning "blazing orbs of fire". They aren't necessarily literal meteors. That could just be a descriptive name. 

Each sphere hits (By my count) 200 squares. Anything with less than 40 effective health against fire/bludgeoning damage can have up to 800 killed by casting this twice...

@SSTEFIX It basically means that you can't benefit from cover. If there's a wall between you and the origin of the blast you still take full damage.

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@Keynoda Yes, Power Word Kill does "less damage on average" just on single target but that is not exactly what makes that spell so strong. No saves against it. No resistance. No immunities. If it is casted on you and you have atm less than 101 HP you are dead. The only thing that could save you would be probably a level 9th counterspell. Some say Death Ward would protect you as well but in my opinion that's not true. Death Ward protects you if your HP falls to 0. But Power Word Kill deals no damage. It just kills you. You pass that line without even triggering Death Ward. You do not enter the dying stage you are just dead(-10) instantly. P.S. To be fair the -10 rule is maybe part of an older version of DnD(i don't know) and I probably don't read the descriptions of all spells(or the right versions) correctly. But I stick with it. No countermeasures besides counterspells for me. My session, my rules. Just change the spell for your liking if it bothers you. 

 A resurrection spell as low as revivify could not stop but rather undo the effect of power word kill. Meteor swarm utterly destroys a body and thus nothing short of the 9th-level true resurrection can undo it.

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Technically it doesn't specify that it destroys the body, unlike spells such as disintegrate, so the body, while probably very badly damaged, remains and can be brought back through a revivify.

 One would presume that the injuries suffered from the collision of a flaming meteor would irreparably mangle the body. Thought it is not specifically stated, the DM might say that the damage is too much to leave the body intact. Revivify states that it isn't even powerful enough to restore severed limbs. True Resurrection can generate a new body.

If you have a spell whose max damage can be survived by a typical barbarian running around in his undies at the same level as a caster who could cast the spell, why would "one presume" that not only is the body "irreparably mangled" as you mentioned in your more recent comment, but completely obliterated without a trace as was suggested when you asserted that nothing shy of a true resurrection would be able to revive something.

Oh you found a finger tip? Well, the 7th level resurrection can fix that no problem, and if you don't care about the new body, you can drop that to a 5th level Reincarnate. I find it far more likely, however, that if you're hit by a spell that a naked body builder can take to the face without slowing down, you might be a bit charred, but fully in tact... So a 5th level raise dead would be no problem... And since as written, Revivify is just straight better than raise dead if performed in the time limit, there's no reason a revivify spell wouldn't be able to bring back a victim of meteor swarm.

It's nonsensical to say that one spell is more overpowered than another as written because of a house rule. If we're bringing house rules into it, let's look at the "less powerful" power word kill. As was stated, it doesn't deal damage. If your health is too low, you just die. Why? What kills you? An aneurysm? I would say that would cause damage. Your body just stops working. Sounds a lot like dieing of old age to me... Maybe it accelerates your time or something. Who knows? Who cares in the world of house rules? If you die of old age, though, your only options are reincarnate (random new body) and wish.

I wonder how Enlarge/Reduce would effect the damage/area of effect of this spell

This spell will take out a Lich in one cast.   

To everyone saying that it's op, you need to be level 20 to cast it so I think it's fair enough

pk starstorm