The Evolution of Dark Matter in the Universe

We know that some galaxies are darker than others. Some galaxies have a larger dark matter fraction than others. We're just sort of shocking because we've been setting galaxies for so long, but every few decades we learn something new and surprising about what's going on with these galaxies. So satisfying our curiosity and trying to understand this in great detail is a good path to opening up some surprising new doors. LIGO is this gravitational wave observatory that has two arms that are kilometers long, filled with lasers,. And they're planning to build one in space called LISA L-I-S-A.