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Question 1 of 3 Easy

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1 Easy

What is the infinitely dense point at a black hole's core?

Answer: Singularity
2 Medium

To become a black hole, Earth must shrink to what size?

Answer: the size of a marble
3 Hard

What is the simplest type of black hole with zero charge?

Answer: Schwarzschild black hole
4 Easy

What is the name of the black hole at our galaxy's center?

Answer: Sagittarius A*
5 Medium

How do astronomers detect black holes that are not actively feeding?

Answer: Gravitational lensing
6 Hard

What theory describes black holes as having no distinguishable outer features?

Answer: No-hair theorem