Is it true that inside each galaxy there is a huge black hole, around which the galaxy rotates? And can we thus say that the galaxy was born of the black hole? （ChatGPT, 2025-7-5)

 This is a profound and fascinating question — one that touches on the frontier between cosmology, astrophysics, and philosophical reflection.

Let’s break it down step by step:

✦ 1. Is it true that inside each galaxy there is a huge black hole?

Yes — for most large galaxies, this is true.

• These are called supermassive black holes (SMBHs).
• Their masses range from millions to billions of times the mass of our Sun.
• The Milky Way, for instance, has one: Sagittarius A*, about 4 million solar masses.

They are typically located at the center (the “galactic nucleus”) and are often surrounded by a dense bulge of stars and gas.

✦ 2. Do galaxies rotate around these black holes?

Not exactly — but the question touches a poetic truth.

• The stars near the galactic center do orbit the supermassive black hole directly, and their orbits have been observed (especially in the Milky Way).
• However, the entire galaxy (especially spiral arms and outer regions) does not rotate around the black hole in a mechanical sense.
• The gravitational pull of a SMBH is dominant only in the very central region of a galaxy (few light-years).
• The majority of galactic rotation is due to the combined mass of:
  
• dark matter halo
• stars
• gas
• and to a small extent, the black hole

So the black hole is not the pivot, but it is the anchor at the heart of a gravitationally complex system.

✦ 3. Was the galaxy born from the black hole?

This is a more speculative question — and it’s still actively debated in astrophysics.

There are two broad possibilities:

A. 

Traditional view

 (older than the galaxy):

• Galaxies form from gas clouds that collapse under gravity.
• Over time, matter accumulates at the center and forms a black hole.

B. 

Newer hypotheses

 (black holes first?):

• Some theories suggest primordial black holes might have formed first in the early universe.
• These could then have acted as seeds for galaxy formation.

Currently, the prevailing view is:

The black hole and the galaxy co-evolve — influencing each other through feedback loops (e.g., jets, radiation, star formation regulation).

So, we cannot say that galaxies were born “from” black holes, but we can say:

Galaxies and their central black holes are born together — bound in a mysterious, possibly fractal, relationship.

✦ 4. Philosophical reflection: The black heart of every galaxy

Now allow a poetic turn:

• The black hole is a gravitational absence that gathers the many.
• The galaxy is a light-dispersing spiral whose center is silence.
• The visible is born around the invisible.

Just as:

The self may form around a wound,

So may galaxies form around the void.

✦ In summary

Question	Scientific Answer
Does every galaxy have a central black hole?	Most large galaxies do.
Do galaxies rotate around it?	Only the central stars do directly. Most of the galaxy rotates due to total mass (stars, gas, dark matter).
Was the galaxy born from the black hole?	Probably not from, but rather with it. They co-evolve.
Can we say the black hole is the “origin”?	Poetically, yes. Physically, it’s complex.

Would you like me to write an essay for you titled:

“The Light and the Void: On Black Holes and the Birth of Galaxies”

Or perhaps something in dialogue with your “自體的心理學”的詩性風格 — such as:

「黑洞如心，星系如夢：宇宙自體之道」

Just say the word.