Most gravity has no known origin. Is it some exotic particle? Nobody knows. Is dark energy responsible for expansion of the universe?… — Neil deGrasse Tyson Copy Share Image
I don't know why anyone would want to study the expansion of the universe. — Ronald Reagan Copy Share Image
“energy of any sort generates gravitational fields and is in turn acted on by gravitational fields, so an energy filling all space… — Steven Weinberg Copy Share Image
In 5 billion years, the expansion of the universe will have progressed to the point where all other galaxies will have receded… — Lawrence M. Krauss Copy Share Image
It was only about sixty years ago that the expansion of the universe was first observed. — Michael Behe Copy Share Image
