It’s a big deal for harry potter fans cause it fixes the Books. Draco was supposed to be a rival to harry that had a redemption arch that in the end turns on Voldemort. But it fell flat on his face.

Harry also just randomly fell in love with a girl that had no chemistry with him making it really bitter. Malfoid fixes all books and fixes all plot holes created by Draco. it’s the best friends to lovers arch from 11 year old rivels to married adults. It’s one of the best Rewrites this decade I think

Their is multiple book rewrites you can find online by actual writers.

The general consensus I can find on what defines a galaxy is "Most astronomers agree on these basics: galaxies are massive, gravitationally bound systems of stars, gas and dust, with an important but poorly understood complement of dark matter. " and it’s not agreed because even with the measurements we have some that lack dark matter. So it is a good and open question even current theory lacks