Apparently General Relativity alone could be enough to avoid the need for both Dark Matter and Dark Energy: https://books.google.no/books?id=MBjkuQAoyZIC&pg=PA

Apparently General Relativity alone could be enough to avoid the need for both Dark Matter and Dark Energy: https://books.google.no/books?id=MBjkuQAoyZIC&pg=PA58&lpg=PA58&dq=General+relativistic+velocity:+the+alternative+to+dark+matter&source=bl&ots=9w3meMOgkn&sig=qufDso8FY1o2bTFPkM0wOkcmVuM&hl=en&sa=X&ved=0ahUKEwiJ4oz2i__TAhXC3iwKHa4hApcQ6AEIRjAF#v=onepage&q=General%20relativistic%20velocity%3A%20the%20alternative%20to%20dark%20matter&f=false https://books.google.no/books?id=MBjkuQAoyZIC&pg=PA58&lpg=PA...