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Originally Posted by Big Trap
I think the dark matter issue is being overly complicated. Maybe because of the cool name ' DARK MATTER '. We can see objects from a far distance in space because of the light it emits, like a star for example. Matter attracts matter so big objects will pull in smaller object via gravity. So there isn't anything stopping a large object that isn't gas or something else that emits light from growing just as huge as something that does emit light. So these large star sized objects won't be seen by us but will have a hell of a gravitational pull. This is what is labeled 'dark matter' Stars don't always explode they could under certain circumstances (depending on what kind of matter it pulled in) just fizzle out and lose that energy that was causing all that heat. Which is another way how a huge star sized object can form but be undetected by us from a far distance. Dark Matter = large object we can't see with a very strong gravitation pull that we can detect.
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The composition of dark matter is still unknown so I'm not sure why you're saying its being overly complicated. Stars also produce a lot more than just heat we can detect most of the by-products of nuclear fission, the most easily detectable one being every wavelength on the spectrum of electromagnetic radiation (not just visible light). We can also see various stages of stars collapsing (neutron stars for example). Any object we cant see but has a strong gravitational pull isn't necessarily dark matter. Singularities are another thing that exhibits that type of behavior. Dark matter is an assigned designation of the differences in mass and and gravitational interaction with visible matter. Its hardly simple though. Even with gravitational lensing we still hardly know anything about its nature.