https://phys.org/news/2024-12-dark-energy-doesnt-lumpy-universe.html "One of the biggest mysteries in science—dark energy—doesn't actually exist, according to researchers looking to solve the riddle of how the universe is expanding. Their analysis has been published in the journal Monthly Notices of the Royal Astronomical Society Letters."   Basically, they claim that there is no need for dark energy because the apparent accelerated expansion of the universe is really due to