The video explains the formation of black holes from collapsing stars, where the core's mass exceeds four times that of the Sun, leading to a singularity. The event horizon marks the boundary beyond which nothing can escape the black hole's gravity. Accretion disks around black holes can emit radiation jets. Despite their reputation, black holes do not consume everything around them. A massive black hole is believed to be at the center of the Milky Way, with others scattered throughout the galaxy. The closest known black hole is 1600 light-years away, posing no immediate threat to Earth.

What happens to a star when its nuclear fuel is exhausted?

• It expands into a larger star.

• It becomes a planet.

• It turns into a comet.

• It collapses into a black hole or a neutron star.

What is the region around a black hole called where nothing can escape?

• Singularity

• Event Horizon

• Accretion Disk

• Radiation Zone

What is the accretion disk?

• A magnetic field around a black hole

• A zone of hot gas spiraling into a black hole

• A solid surface around a black hole

• A light-emitting region around a black hole

If the Sun were replaced by a black hole of the same mass, what would happen to Earth?

• Earth would stop orbiting and drift into space.

• Earth would be immediately pulled into the black hole.

• Earth would continue orbiting as usual.

• Earth would be pushed away from the black hole.

How far is the closest known black hole from Earth?

• 1600 light-years

• 5000 light-years

• 100 light-years

• 10,000 light-years