In accordance with fashions and simulations, all galaxies ought to be embedded in darkish matter halos, whose densities peak on the galactic facilities. On lengthy sufficient timescales, of maybe a billion years, a single darkish matter particle from the outskirts of the halo will full one orbit. However different options to the “lacking mass” issues, aside from darkish matter, should at all times be thought-about and in contrast with the observational information. (Credit score: NASA, ESA, and T. Brown and J. Tumlinson (STScI))
There’s an additional supply of huge “stuff” in our Universe past what gravitation and regular matter can clarify. Might mild be the reply?
Though the “darkish matter drawback,” because it’s identified at this time, is without doubt one of the greatest cosmic mysteries on the market, this wasn’t how we at all times conceived of…
