I found proof for upgrading MCU Thor and Gorr to at least 4-C star level based solely on the star-moon relationship of the Shadow Realm in Love & Thunder.
The new wording for Gorr would be:
"At least Star Level (Empowered by the Necrosword, whose power moved both the star and moon of the Shadow Realm to the Gate of Eternity at the center of the universe"
The wording for Thor's attack potency and durability would remain the same:
AP: "Fought evenly against Gorr the God Butcher on multiple occasions"
Durability: "Tanked a direct hit from Gorr's All-Black the Necrosword and endured a beating from him)
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The Proof:
The Disney+ official English [Audio Description] of Love & Thunder at timestamp 1:14:30 says "Light from a blazing
sun revealed behind the celestial body washes over Jane's awed face just before the Goat Boat crashes into the surface of the
moon."
Then the Disney+ official English [Audio Description] of Love & Thunder at timestamp 1:28:40 says "In the Shadow Realm, the silhouette forms of the children can be seen against the bright glow of the
sun as giant boulders float together to form pillars. With Stormbreaker slung across his back, Gorr stands at the front of the children and watches as chunks of the
moon form the cracked stone floor of the structure around them."
This means Gorr generated the force necessary to move the mass of both the star and moon of the Shadow Realm from its previous position to the Gate of Eternity at the center of the universe.
We know this because the very previous scene is Thor and Valkyrie discussing directions to Eternity at the center of the universe, so Thor would not get lost. This discussion would be unnecessary if the previous position of the star and moon of the Shadow Realm had already been at the Gate of Eternity in the center of the universe, since Thor already knew how to reach the moon of the Shadow Realm and in fact had just been there a few minutes ago onscreen.
We also know that, at timestamp 1:28:40, the star and moon of the Shadow Realm are clearly in a different position than during Gorr's previous battle with Thor, Jane and Valkyrie at timestamp 1:21:10, because at timestamp 1:28:40 Gorr, the children, and outer space are in
color instead of the
black-white-gray of the previous battle.
Note that the Shadow Realm itself has areas of color, as proven at timestamp 43:31, when Thor first identifies that this is where the caged children are located. Thor, the children, and outer space are in color at timestamp 43:31, yet Thor says "I know where you are" and then a few seconds later "They're in the Shadow Realm."
He does not say "I know where you're going" and
he does not say "They're going to the Shadow Realm." They are already there, in color.
At timestamp 43:31, the children also are on a large floating rock in outer space, which is definitely under Gorr's control. This proves Gorr can move large amounts of matter through outer space.
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IMPORTANT:
It does not matter whether Gorr directly moved the star and the moon to the Gate of Eternity, or whether Gorr only moved the moon while the star somehow orbits the moon on its own.
Why? At timestamp 33:57 Love & Thunder explicitly shows onscreen in the movie that the laws of centripetal force (F=mv^2/r) and Newton's law of universal gravitation (F=G*Mm/r^2) apply to actions in the MCU. Jane, an in-universe astrophysicist, teaches a lecture with both formulas on her whiteboard. She can only teach what she perceives, and she clearly perceives these laws of physics in that universe.
NASA says the laws of centripetal force and Newton's law of universal gravitation apply to objects such as our own Sun's pull on the Earth,
and that both forces are equivalent to each other when also accounting for velocity.
https://imagine.gsfc.nasa.gov/features/yba/CygX1_mass/gravity/sun_mass.html
Therefore, applying these laws and formulas to Gorr and/or the star-moon relationship of the Shadow Realm, this means that either the moon itself has
much more mass than the star in order to keep the star orbiting the moon, or Gorr himself must generate enough centripetal force / gravitational attraction to simulate that greater mass ... as they all move from the place of battle at timestamp 1:21:10 to the center of the universe at timestamp 1:28:40.
The laws of centripetal force and Newton's law of universal gravitation also mean that even if we take a low mass for a real star, 3% of the sun's mass, either Gorr himself or the moon itself must generate
at least 9.79x10^37 Newtons of force to keep it orbing the moon, if we assume 1 orbital rotation per minute velocity (onscreen approximation) at a distance of 1 astronomical unit (Earth to Sun). Increasing the velocity, and/or decreasing the distance, increases the force needed.
Mass of our sun = 1.989x10^30 kilograms
3% mass of our sun = 5.9x10^28 kilograms = M
r = 1 astronomical unit = 1.495x10^11 meters
v = 1 orbital rotation per minute at 1 astronomical unit = 1.56x10^10 meters per second
Centripetal force = F=Mv^2/r = (5.9x10^28 kilograms x (1.56x10^10 meters per second squared)) / 1.495x10^11 meters =
9.79x10^37 Newtons
Mass of the moon = m =v^2r/G = ((1.56x10^10 meters per second squared) x 1.495x10^11 meters) / Gravitational constant 6.67x10^-11 =
5.5x10^41 kilograms = m
Gravitational attraction = F=G(Mm/r^2) = Gravitational constant 6.67x10^-11 x ((5.9x10^28 kilograms x 5.5x10^41 kilograms) / 1.495x10^11 meters^2) =
9.79x10^37 Newtons
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In a universe with Infinity Stones and weapons forged from neutron star material, a building-sized moon with large star-level mass would be very possible.
