I'll address the comments above.
personally believe that the Meteor comes from space because as shown later in the series, a stronger attack named Deus Sema is used where a Meteor is pulled from Space and brought to the planet, so that shows that Sema itself is a spell in where someone summons a previously existing Meteor, that means Jellal didn't create the Meteor in the clouds, but summoned it from somewhere, and there are no Meteors just floating in the clouds, the Meteor would have had to be pulled from Space at the very least.
That's a Fallacy By Association. Just because Sema and Deus Sema both involve dropping a meteorite doesn't mean they both accomplish this in the same fashion. With Irene's Deus Sema we are shown a clear shot of Irene's meteorite being pulled from Space meanwhile with Jellal we see no such thing. As we see his a hole being made in a cloud and his Sema appears. We don't have a valid way of knowing where his Sema came from unlike Deus Sema. I find it that assuming Jellal brought the meteorite down from space to be filled with assumptions, especially by scaling it to Deus Sema which in itself is a Fallacy By Association. Deus Sema is stronger for a reason and reason is that it comes directly from outer space. In Jellal's case it's never shown where it originated. I.E the low end is the safest route to take with the least amount of assumptions.
and we shouldn't just counter reasons by saying that it's safer to assume Jellal created the Meteor which would make it fundamentally different from Deus Sema which is just supposed to be a stronger version of Sema, not an entirely different spell
This isn't a valid counter argument either. It is indeed safer to assume the meteorite was made than to assume Jellal pulled it down from space whenever nothing supports it. Aside from Irene's Sema, which doesn't work since Deus Sema is stronger for a reason and we see how it's done. The Burden of Proof is on you to prove that it came from space, it's not us to prove a negative.
Also for those curious the description for Deus Sema is the following.
Deus Sema (þÑ×Òü«µÿƒÕ║ºÕ┤®ÒüùÒâçÒéªÒé╣Òâ╗Òé╗Òâ╝Òâ×Deusu Sēma) is a master enchantment, Using their overwhelming Magic Power, the user enchants an asteroid from space to come crashing down to Earth as a meteor. The meteor is large enough to completely obliterate a large battlefield and kill everyone on it upon impact. Deus Sema is also a much stronger version of the similar, yet different, Sema.
Vs Jellal's Sema description
True Heavenly Body Magic: Sema (þ£ƒÒâ╗Õñ®õ¢ôÚ¡öµ│ò µÿƒÕ┤®ÒüùÒé╗Òâ╝Òâ×Shin Tentai Mahō Sēma) is an advanced Heavenly Body Magic Spell.
The user bows down and points his hands downwards, with all the fingers closed except the index and middle fingers. The user then begins to slowly move their right hand until it points upwards, causing the clouds above them to begin circling around, forming a cyclone as the skies darken. From the center of the swirling formation, a glowing orb begins to form, growing in size until a humongous meteor emerges, falling quickly to earth towards the intended target. When the meteor hits, the force is strong enough to create a large explosion, which engulfs a wide area and releases a strong hurricane of air, also leaving a large crater in its wake.
