42 points
I think a lot of people understand the concept of light-seconds, which can measure distance in seconds.
Allow me to introduce the gravity-second. 1 gravity-second of mass-energy is enough mass-energy to have a Schwarzchild radius of 2 light-seconds.
20 points
32 points
Size of a black hole.
Certain mass = certain distance
Distance = seconds
Therefore mass = seconds
9 points
Then I don’t even want to be in same solar system with millisecond heavy object.