http://www.huffingtonpost.com/2012/12/13/oldest-galaxy-distant-star-system-hubble-photos_n_2287961.html
Here you go. This is a perfect example. These guys remeasured their "oldest" galaxy (hmmm, btw what could have urged them to remeasure a galaxy they already mea$$$$$$$?) and found that their measurements had changed.
Haven't read the original papers, so I could be way off with this, but here's what often happens:
Measurement A gives result 13.23 with a standard error of +/- 0.09
Measurement B gives result 13.31 with a standard error of +/- 0.03
These measurements are in good agreement. Measurement A is valid, so is measurement B. If these are the only 2 measurements done, we can combine them to form our current best estimate: 13.30 +/- 0.03 (
http://en.wikipedia.org/wiki/Weighted_mean#Dealing_with_variance)
It's been said so many times before, but:
Your criticising from a viewpoint that lacks a lot of critical information. It's great that your interested in new ideas, but great ideas almost always require great hard work.
I sincerely promise you, if you manage to create a new theory that explains some of the weird and wonderful the universe throws at us, backed up by doing the proper maths and comparing to real data, you will be hailed as a genius. If it's an important enough problem you'll get the nobel prize.
Challenging the status quo is a big part of being a researcher, but most of us take on *very* small parts because it's more feasible. Attacking the fundamental building blocks is harder, not because there's some conspiracy opposing it, but because it's damn near impossible to find any better ones.
MOND (modified newtonian dynamics) is a great example of this. You don't get much more fundamental that F=ma.
Were the researchers who thought of it fired? No. They were almost certainly promoted. They challenged one of the biggest building blocks of physics and were rewarded for their innovative thought, not crushed by some physics-illuminati.
Still, it seems that they were wrong. F=ma is just so damn good. Nothing else works better. People are still trying to challenging it, maybe they'll succeed, but for now we stick with it because we haven't got anything better.