> Matter is easy to see when it emits light (like stars)
That's the part I don't get; if the intergalactic medium is that hot, shouldn't it be emitting huge amounts of blackbody radiation? Supposedly ionization interferes with that, but even black holes emit blackbody radiation (hawking radiation), so that seems like a insuffient explaination.
That's the part I don't get; if the intergalactic medium is that hot, shouldn't it be emitting huge amounts of blackbody radiation? Supposedly ionization interferes with that, but even black holes emit blackbody radiation (hawking radiation), so that seems like a insuffient explaination.