Actually we've been testing these experiments for a long time.
The problem I have with this is that its all speculation. There's no way they can test their hypothesis. they're going off fairy dusty and a lot of sunshine. They can't recreate those conditions here on Earth in a lab, its impossible and never will be. so how are they making all these assumptions?Theoretical Science is a lot of theory with little no observerable evidence to support said theory thus not making it a theory but a fancy hypothesis.
Look up gravitational lensing and gravity wells: http://www.space.com/20826-einstein-gravity-theory-toughest-test.html
Last year we JUST proved something Einstein theorized.