That Galaxy With No Dark Matter It's Probably Not Real - SciShow News

The video discusses two major astronomical findings. First, it revisits the galaxy NGC 1052-DF2, initially thought to lack dark matter, but new studies show it has a normal amount. The confusion arose from inaccurate distance measurements. Second, it explores the supermassive black hole Sagittarius A star at the Milky Way's center. Researchers captured the first image of cool gas in its accretion disk, confirming its existence and rotation. These findings enhance our understanding of galaxy formation and black hole behavior.

What was initially thought to be unusual about the galaxy NGC 1052-DF2?

• It contained no stars.

• It was moving away from the Milky Way.

• It was the largest galaxy discovered.

• It had virtually no dark matter.

Why was the initial study of DF2's dark matter content considered inaccurate?

• The distance measurement was likely incorrect.

• The galaxy's color was misinterpreted.

• The galaxy was too far to observe.

• The study used outdated technology.

What was the revised distance to DF2 that led to new conclusions about its mass?

• 100 million light years

• 65 million light years

• 42 million light years

• 26 million light years

What is the name of the supermassive black hole at the center of the Milky Way?

• Sagittarius A*

• Orion B*

• Cygnus X-1

• Andromeda A*

What recent discovery was made about the accretion disk of Sagittarius A*?

• It contains no gas.

• It is moving away from the galaxy.

• Cool gas was found in the disk.

• It is composed entirely of dust.

How did researchers confirm the rotation of the cool gas around Sagittarius A*?

• By tracking its speed over time.

• By measuring its temperature.

• By observing its color change.

• Using redshift and blueshift measurements.

What does the discovery of the cool gas around Sagittarius A* help scientists understand?

• The size of the Milky Way.

• The formation of new stars.

• The distance to other galaxies.

• The accretion process of black holes.