Yes ( and I can assure you that anybody working on astrophysics is aware of the problem). In addition perfectly ordinary astrophysics can sometimes mimic the ef

Yes ( and I can assure you that anybody working on astrophysics is aware of the problem). In addition perfectly ordinary astrophysics can sometimes mimic the effects of such observations. On the other hand, given the current funding situation, there is simply no way to build a laboratory were you can use a 7 billion light year baseline in a controlled and repeatable way.