One way to solve the dark matter problem is to chalk it up to black holes formed moments after the big bang, but they can’t account for all the dark matter… Read the rest
If dark matter isn’t heavy and interacts even weakly with normal matter, we should drag our detectors out from underground to catch it… Read the rest
One of the earliest indications of the existence of dark matter came from an examination of the rotation of nearby galaxies. The study showed that stars orbit the galaxy at speeds that indicate there’s more mass there than the visible matter would indicate. Now, researchers have taken this analysis back in time, to a period when the Universe was only a couple billion years old, and the ancestors of today’s large galaxies were forming stars at a rapid clip.
Oddly, the researchers find no need for dark matter to explain the rotation of these early galaxies. While there are a number of plausible explanations for dark matter’s absence at this early stage of galaxy formation, it does suggest our models of the… Read the rest