Exploring Stellar Relationships and Cataclysmic Events

What happens to a star in a binary system when it becomes a white dwarf?

• It collapses into a black hole.

• It expands into a red giant.

• It merges with its companion star.

• It ejects its outer layers and becomes a dense core.

What did the royal astronomers of King Sejong's court observe in 1437?

• A solar eclipse

• A meteor shower

• A new point of light in the sky

• A supernova explosion

What is a cataclysmic variable?

• A black hole consuming a star

• A single star with variable brightness

• A binary system with a white dwarf accreting matter

• A type of supernova

How do X-ray binaries differ from cataclysmic variables?

• They are less common in the galaxy.

• They are not part of binary systems.

• They do not emit any radiation.

• They involve neutron stars or black holes instead of white dwarfs.

What is the primary characteristic of a black widow system?

• A black hole with a large accretion disk

• A neutron star consuming a brown dwarf

• A white dwarf with a strong magnetic field

• A pulsar with a strong magnetic field

What happens to the companion star in a redback system?

• It becomes a white dwarf.

• It merges with the pulsar.

• It is gradually stripped away by the pulsar.

• It becomes a black hole.

What is the ultimate fate of a white dwarf in a cataclysmic variable system?

• It becomes a neutron star.

• It turns into a black hole.

• It merges with its companion star.

• It explodes as a Type 1 supernova.

What is a primordial black hole?

• A black hole that is larger than average

• A black hole that emits no radiation

• A black hole formed in the early universe

• A black hole formed from a dying star

Why can't a regular star generate detectable gravitational waves in a merger?

• It is too small.

• It is not dense enough.

• It is too far away.

• It is not part of a binary system.

What shape do the event horizons of merging black holes form just before they combine?

• A perfect sphere

• A flat disk

• An hourglass shape

• A spiral