Please, show me something that had good evidence a decade ago that is now known to be incorrect.

No science is not too much about assumptions.  The discovery channel is filled with sensationalized nonsense put together by film crews with no concept of what they are filming.  When one of my projects was on the channel they completely mischaracterized the implications of the science. Yes theoretical cosmology is far stranger than most people are ready to accept, many of the hypothesis will not stand up when we are capable of testing them.  The LHC for example invalidated many hypotheses (money very well spent).  The vast majority of science is based on empirical evidence and experimentation.  Theoretical physics is dominated by mathematical models because the cost to test the assumptions is incredibly high.

I get what you mean I was just looking at something a few days ago that said the Universe is really just a projection and that there are multiple universes, could it be possible? Sure, but the odds of that being the case are astronomical.

Assumptions are necessary, as we simply aren't at the point of understanding the overwhelmingly large set of minutia regarding interactions that affect everything in the universe. However, that is not to say that using assumptions makes science less factual. As we further research, expand our knowledge-base and ultimately further understand the situation/interaction etc. that we are analysing theoretically, the assumptions used can be refined.

But, as said above, don't take anything said on the discovery/science channel as gospel.

You need Assumption-
without Assumption there'll be almost no progress,or a very slower one.

Big scientific discoveries were almost never made by guys who just follow rules like clerks in a minion like style.
You need Ideas,Inspiration and out of the box thinking.
Even if 99% of those ideas turn out to be bullshit the 1% may change the world.
People like Heissenberg,Plank,Einstein,Poincare,Newton or Tesla made their discoveries because they were dissatified by the official standards of science ,made assumptions and changed standards.
I don't believe in parrallel universes or 11D -Space as i think the universe gives a shit about human theories and the current dark matter theory proves how little we really know as we created dark matter out of thin air to keep
the current and acceppted theory about the evolution of universe alive.

If the main and basic matter of this universe is something we know nothing about(dark matter) than assumption is the only way to go on is assumption or we prove this theory is just cargo cult science.

1. Bad article. The projection thing is very complex mathematics and doesn't say anything about our universe "being" a projection.

2. Multiple universes is an interpretation of quantum mechanics that is mathematically consistent but not something you should think of as real.

It's not about "the odds" of it being like that.

not at all

And you made all these conclusions without understanding any of the underlying theory? Wow.

Dark matter has good evidence and there's no feasible alternative. If you come up with one with better evidence than a dark matter theory then by all means publish. The scientists I know would love to see a better theory that doesn't need it, they're not trying to keep anything 'alive'.

What makes you think we know nothing about it? We can measure where it is and how much of it there is, it's just a kind of particle that doesn't react to the electromagnetic force but does react to gravity.