Here’s a headline for you: Physicists find black holes in globular star clusters, upsetting 40 years of theory This story (and others with similar titles) has been making the rounds of science fans. So how does this upset 40 years of theory? It doesn’t.
Space Detective
A research team studied photographic plates from the Harvard College Observatory. From the plates they were able to gather about 500 historical data points. This allowed them to prove that two supermassive black holes are orbiting each other.
Matters of Gravity
By the principle of general relativity, free fall under gravity and the absence of gravity feel the same because they are the same. The idea seems ridiculous because we can see the space station orbit the Earth, so something must be pulling it. But remember that space and time are not absolute.