A domino can knock over another domino 1.5x larger than itself.
The above Gif shows a domino 5 millimeters tall starting a chain reaction 13 dominos long that eventually knocks over a domino about half a meter tall.
If the reaction was 29 dominos long, the final domino would be the size of the Empire State Building.
An invisible force at the center of our galaxy
Scientists have theorized that our Milky Way galaxy has a super massive black hole at the center of it, but how did this idea come about? How do astronomers measure something that has actually never been seen in our telescopes?
Above is an animation of star movements in our galaxy over the past 16 years. They all orbit around a point that emits no light in our galaxy. We can measure the mass of these stars and calculate that their orbits require an object with the mass of 4 million Suns. So far this points to a super massive black hole in our galaxy.