Final answer:
The Hubble Space Telescope has provided evidence for supermassive black holes at the centers of galaxies that contain immense masses and contribute to energetic cosmic phenomena. There is a relationship between the mass of a galaxy and its central black hole, with galaxies seemingly growing in tandem with their black holes.
Step-by-step explanation:
Hubble Space Telescope observations have provided substantial evidence for the presence of supermassive black holes in the centers of galaxies. These supermassive black holes are so massive that they can contain more than a billion solar masses.
Observations suggest that there is a tight correlation between the mass of a galaxy and the mass of its central black hole, indicating that as galaxies grow larger, so do their black holes.
Furthermore, the mass of these black holes is so large that they greatly influence their surrounding environment and contribute to some of the most energetic phenomena observed in the universe.
The existence of supermassive black holes is confirmed by demonstrating that the amount of mass present in the center of a galaxy is so huge and the volume so small that no other known objects could account for it.
For example, the center of our own Milky Way Galaxy is believed to contain a black hole with a mass equivalent to 4.6 million Suns, all crammed into a space less than the diameter of Mercury's orbit.
This provides strong evidence that supermassive black holes really do exist despite us not being able to see them directly because they emit no energy and are often shrouded by interstellar dust.