Board Thread:Naruto Discussions/@comment-31074250-20170410160032/@comment-26424744-20170411053816

DB4 calls the parallel time-spaces her dimensions. In the manga Kaguya says "this is my time-space", we later find out Kaguya can create new time-space's. Momoshiki who is weaker than Kaguya, as he was trying to attain her power was stated to have created the parallel time-space in the Boruto movie novel "He was even draining the chakra that was beyond the parallel dimension he’d made."

Hence we know Kaguya created the parallel time-space's.

Kaguyas alternate dimensions can be confirmed to be atleast the size of a Solar System for these reasons,
 * A sun can be seen in the sky of Kaguyas sand dimension multiple  times.
 * A bright moon can be seen in the sky of Kaguyas ice dimension . Which means that a star must be casting light on the moon.
 * Sun-rays can be seen in one of Kaguyas alternate dimensions.
 * Kaguyas ice dimension can be seen to have a day and night cycle. This indicates the presence of a star.

Kaguya showed no fatigue and grew more powerful after destroying and creating a time-space which are at least the size of a Solar System.

She is capable of instantly rewriting the time-space of any of her 6 dimensions which are at least the size of a Solar System.

So Kaguya is Solar System level+, after all Kaguya is on a whole different level than the Ten Tails which literally is the planet, and has multiple moon to planet level feats.

The downplay that the Naruto verse gets is pretty severe.