No, the difference is you haven't actually predicted anything precise, so you have nothing but an untestable supposition. It's completely disingenious of you to say things like the following : That's complete nonsense. Dark matter models can qualitatively explain observations AND quantitatively predict things like alterations to galaxy rotation rates, small scale variations in the CMB and the Bullet cluster. They make quantitative predictions, so they can be put to the test. If you think your vague arm waving is on the same level as dark matter models you're, frankly, delusional. Or at the very least extremely poorly informed about anything in mainstream cosmology. Actually I wouldn't even put your 'claims' on the level of an hypothesise, not in the scientific sense. An hypothesis can be quantitatively test. Dark matter hypotheses allow models to be constructed, they are developed and partly motivated by quantitative formalisms and the resultant logical development. You have essentially a random guess based on absolutely no quantitative motivation, no access to data, no understanding of mainstream models, their pros and cons and only a small amount of reading of pop science websites and perhaps books. You mention redshift values. Do you have in your possession a catalogue of redshift observed values and the source properties? If so (which I very very much doubt) what analysis have you done of them? 'Perfectly justified'? You're mistaking 'minor qualitative motivation' for 'perfect justification'. You don't have anything quantitative so it's obviously not perfect. So you do have in your possession actual telescope observations or compiled cosmology data? And how do you have data before the people actually running observatories and telescopes? Have you put your own telescope into orbit or something? Or are you just being fast and loose with your descriptions? Your attitude here is the same as when on PhysForums you tried to start some collaborative effort to develop a theory of everything, as if all that was needed was just a few lay persons putting their ignorant heads together, as if collaborations didn't exist in the research community. You have an utterly unrealistic view of your own musings or abilities compared to anything remotely scientific.