Scientists discover extremely massive black hole

The video discusses the discovery of a massive stellar black hole, LB-1, located 15,000 light-years from Earth in the Milky Way galaxy. Professor Liu Jifeng and an international team found that LB-1 has a mass 70 times greater than the sun, challenging previous estimates of stellar black hole sizes. The discovery was made by observing stars orbiting the black hole, with LB-1's companion star having eight times the sun's mass. China's Large Sky Area Multi-Object Fiber Spectroscopic Telescope played a crucial role in the discovery, while telescopes in Spain and the US helped determine LB-1's physical parameters.

What is the mass of the stellar black hole LB-1 compared to the sun?

• 20 times the mass of the sun

• 50 times the mass of the sun

• 70 times the mass of the sun

• 100 times the mass of the sun

How did scientists identify the presence of LB-1?

• By analyzing dark matter

• By measuring cosmic radiation

• By observing stars orbiting a black hole

• By detecting gravitational waves

What is the mass of LB-1's companion star relative to the sun?

• 8 times the mass of the sun

• 10 times the mass of the sun

• 5 times the mass of the sun

• 12 times the mass of the sun

Which telescope was primarily credited with the discovery of LB-1?

• China's Large Sky Area Multi-Object Fiber Spectroscopic Telescope

• Gran Telescopio Canarias

• Keck 1 Telescope

• Hubble Space Telescope

What role did the Gran Telescopio Canarias and Keck 1 Telescope play in the study of LB-1?

• They measured the distance to LB-1

• They determined the physical parameters of LB-1 and its companion

• They discovered LB-1

• They analyzed the chemical composition of LB-1