Question: @Bella: How many planets have the biggest black holes eaten?

Bella Boulderstone answered on 20 Jun 2019:

They usually tend to eat stars rather than planets and then the supermassive black holes we think formed through collisions with other black holes. So I don’t know that the biggest black holes have eaten many planets at all, more like other black holes and stars!

However, the ones at the centre of the universe tend to grow quite slowly, (the one at the center of our galaxy is only eating fractions of the mass of the sun per year) and it tends to be something called plasma that they eat, which is a really hot, electrically charged gas.