Big and ubiquitous…

Dear Cheap Astronomy – How does the galaxy rotate? 

There is something weird about how stars rotate in the Milky Way Galaxy – and probably in any other rotating galaxy.

Dear Cheap Astronomy – What is intergalactic dust made of? 

So firstly, hooray for intergalactic dust. Traditional estimates of how much known baryonic matter there is (that is, light not dark matter) never quite matched calculations of how much baryonic matter there should be given the expected amount of nucleosynthesis that should have happened within the first three minutes after the Big Bang.

 

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