What makes it difficult for astronomers to detect most black holes in the Milky Way?

• Their small size

• Their incognito nature

• Their bright light

• Their rapid movement

How were black holes initially perceived in the context of Einstein's equations?

• As fictional entities

• As theoretical constructs

• As real objects

• As visible stars

What is the estimated distance of the closest known black hole to Earth?

• 10,000 light years

• 1 million light years

• 1,550 light years

• 100,000 light years

What is the primary method used to infer the presence of a black hole in a binary system?

• Detecting radio signals

• Observing x-ray emissions

• Analyzing the motion of a visible star

• Measuring gravitational waves

What is the role of the Gaia satellite mission in black hole research?

• It detects gravitational waves

• It captures images of black holes

• It narrows the search for black holes

• It measures the temperature of black holes

What phenomenon is created when two black holes interact and merge?

• A supernova

• A gravitational wave

• A black hole explosion

• A star formation

What is the main challenge in observing non-interacting black holes?

• Their lack of an accretion disk

• Their rapid rotation

• Their bright emissions

• Their high temperature

What is the significance of the discovery of gravitational waves?

• It confirms Einstein's theory of relativity

• It proves the existence of black holes

• It helps in star formation

• It allows for faster-than-light travel

What is the significance of the accretion disk in detecting black holes?

• It forms a new star

• It creates gravitational waves

• It provides information about the black hole's mass

• It emits visible light

How do astronomers differentiate between black holes and neutron stars in binary systems?

• By observing their color

• By analyzing their mass

• By detecting their sound

• By measuring their temperature