I read that gravitational waves are so tiny that we need extremely precise equipment to detect them. I am no physicist, but GR really intrigues me and I was wondering about two things:
- How powerful would a gravitational wave have to be for an average human to notice its effects, and what would those effects look like? How would these effects change as a function of the energy of the wave?
- What kind of cosmic event (e.g. black hole on black hole collision) could cause these gravitational waves?