The densest cosmic object, some of these can be millions or billions of times heavier than our sun, and most galaxies have one at their core.
What are black holes?
500
The number of half-steps in a major scale
What is two?
500
A president who has recently re-elected for the third time by a vast majority, despite much opposition, there are debates as to whether or not he has rigged the vote, or won fair.
Who Is president Putin of Russia?
500
The thing under yellow stone park that has not been active for 700,000 years.