I once said, “when I was in school, there was no dark matter and no dark energy”. I was correctly corrected on this, because dark matter and dark energy exist independent of whether we know about them or not.
Maybe. According to some recent theorizing, dark matter and dark energy may not exist after all:
discusses a gravitational theory from Petr Horava, a physicist at the
"Horava gravity may also create the “illusion of dark matter,” says cosmologist Shinji Mukohyama of
“If that’s not enough, cosmologist Mu-In Park of Chonbuk National University in
I think it's fascinating that dark energy and dark matter went from being unknown to possibly most of the universe and now possibly to nonexistent. I wish I was 10 again, and could cram all the math into my head that could possibly go in there, just to have a shot at dealing with problems like this.
[Horava's name has been converted to standard English characters.]