Transparent Galaxy

31 Mar 2018

At ... (see also ) ... a transparent galaxy about the size of our Milky Way is causing problems for cosmologists. The study is published by Nature journal and the researchers seem to have discovered a galaxy that is dark matter free. Oh dear. The galaxy is not abundant with stars which makes it even more mysterious - but those that can be seen are banded in bright clusters. We are assured that in most galaxies there is five times more dark matter than visible matter - also a dark matter halo. So, did the same galaxy form in a defferent way to the others? There follows a sermon on the nature of dark matter. That is of course the BBC way but a more nuanced take can be found at the second link, Tall Bloke's talk shop. The comments are also good with some further links such as and ... but the main thrust is that if dark matter is absent from one galaxy it is also probably absent from all the other galaxies. Astrophysicists have a different take it would seem - as dark matter is absent from one galaxy this proves it is present in other galaxies. Such thinking may indicate how the idea evolved in the first place - cosmologists unable to divorce themselves from red shift distances. Back to square one perhaps - and Halton Arp.