Question

question 12 of 25 > which of these are actual evidence for the existence of a black hole in the center of the milky way, and which are not? stellar velocities near the center of the galaxy indicate four million times the mass of the sun inside their orbit. very large telescopes have imaged the black holes event horizon. the radius of the orbits of stars near sagittarius a indicate a massive central body smaller than the solar system. quasar emission features are detected from sagittarius a. astronomers observe an extremely bright and compact radio source. stars are observed to pass the event horizon.

Explanation:

1. Stellar velocities near the center indicating a large mass is evidence as the gravitational pull of a massive object (like a black - hole) affects the motion of nearby stars.
2. Imaging the event horizon is strong evidence. The Event Horizon Telescope has imaged the event horizon of the super - massive black hole at the center of the Milky Way.
3. A massive central body smaller than the Solar System deduced from star orbits near Sagittarius A* is evidence as black holes can be extremely compact yet very massive.
4. Quasars are typically found at the centers of active galaxies and are not typical evidence for the black hole in the Milky Way's center. Sagittarius A* is not a quasar.
5. An extremely bright and compact radio source (Sagittarius A*) is evidence for a super - massive black hole at the center.
6. Stars passing the event horizon has not been directly observed as it is extremely difficult to observe such an event due to the nature of the event horizon and the limitations of our current technology.

Answer:

1. True
2. True
3. True
4. False
5. True
6. False