RE4 - 10A - Black hole

What is the boundary of a black hole called?

• Event horizon

• Singularity

• Accretion disk

• Quasar

What is the mass range of stellar black holes?

• 50 to 100 times the mass of our sun

• More than 100 times the mass of our sun

• 10 to 20 times the mass of our sun

• 1 to 5 times the mass of our sun

What is the mass of Sagittarius A?

• 4 million suns

• 2 million suns

• 8 million suns

• 1 million suns

How do scientists detect and study black holes?

• By observing their color

• By observing their size

• By observing their effect on nearby matter

• By observing their temperature

Who calculated that any mass can become a black hole if compressed tightly enough?

• Isaac Newton

• Stephen Hawking

• Karl Schwartzschild

• Albert Einstein

When was the first black hole discovered by astronomers?

• 1999

• 1985

• 1971

• 1916

What is the diameter of Sagittarius A compared to the distance between the earth and our sun?

• Half the distance

• Equal to the distance

• Twice the distance

• One-tenth of the distance

What are the jets of particles that blast out of supermassive black holes called?

• Accretion disk

• Singularity

• Quasars

• Event horizon

What is the point of no return in a black hole?

• Singularity

• Quasar

• Accretion disk

• Event horizon

What is the mass range of supermassive black holes?

• 100 to 500 times the mass of our sun

• 1,000 to 5,000 times the mass of our sun

• 10,000 to 50,000 times the mass of our sun

• Millions to billions of times the mass of our sun