- Rupsa Dasgupta, FYBSc
In the early 1930s, scientists discovered something very peculiar in the universe. The galaxies they observed were rotating with an incredibly high speed- so high that the visible matter in them could not possibly generate the necessary gravitational force required to hold them together. With such rotational speed, they should have fallen apart ages ago.
But they hadn’t. So what was the source of this additional force holding these galaxies together?
It wasn’t until the 1980s that scientists fi