Understanding Black Holes

How do scientists detect black holes if they are invisible?

• By feeling the gravitational pull directly

• By studying the movement of objects around them

• By listening to the sounds they make

• By observing the light they emit

What happens when a massive star runs out of energy?

• It turns into a comet

• It becomes a planet

• It forms a black hole

• It disappears completely

What is a singularity in the context of black holes?

• A point with infinite mass

• A point with no mass

• A point with no gravity

• A point with infinite density

How does gravity relate to mass?

• More mass means less gravity

• More mass means more gravity

• Mass and gravity are unrelated

• Gravity only affects objects without mass

What is the event horizon of a black hole?

• The center of the black hole

• The boundary beyond which nothing can escape

• The point where light can escape

• The surface of the black hole

What is a stellar black hole?

• A black hole with the mass of a single sun

• A black hole with no mass

• A black hole with the mass of a dozen suns

• A black hole with the mass of a galaxy

What is a supermassive black hole?

• A black hole with no event horizon

• A black hole with the mass of a planet

• A black hole with the mass of millions of suns

• A black hole with the mass of a few suns

What is the Event Horizon Telescope designed to do?

• Capture visible light images of black holes

• Measure the temperature of black holes

• Detect sound waves from black holes

• Capture radio wave images of black holes

How does the Event Horizon Telescope work?

• It relies on infrared technology

• It uses satellites to capture images

• It combines data from telescopes around the world

• It uses a single large telescope

What does the accretion disk around a black hole do?

• It emits light and radiation

• It reflects light away from the black hole

• It cools down the black hole

• It prevents the black hole from growing