It's been 472 since humanity realized the Earth moves around a star, 328 years since we knew the equations of gravitation, only 100 since we learned about GR, a

It's been 472 since humanity realized the Earth moves around a star, 328 years since we knew the equations of gravitation, only 100 since we learned about GR, and only 15 years since we were certain the universe is expanding. I think we might be excused to take a few more years to nail down the rest of gravitation. There's an embarrassment of riches of data; it just needs assembling into a picture.