4.6 How to Make Black Holes

What prevents the gravitational collapse of a star until it exhausts its fuel?

• Thermal energy

• Electron degeneracy pressure

• Strong nuclear force

• Magnetic fields

What is the escape velocity of Earth?

• 5 km/s

• 11.2 km/s

• 9.8 km/s

• 15 km/s

What term describes the boundary around a black hole from which nothing can escape?

• Schwarzschild radius

• Event horizon

• Gravitational boundary

• Photon sphere

How do astronomers detect the presence of a black hole?

• Direct visual observation

• Measuring surface temperature

• Detecting emitted light

• Observing effects on nearby objects

What phenomenon allows black holes to emit radiation, according to Stephen Hawking?

• Quantum tunneling

• Photon emission

• Quantum fluctuation

• Nuclear fusion