How Much of the Universe is Black Holes?

TL;DR

The universe has Stellar Mass and super massive black holes, with potential implications for its future composition.

Transcript

there's two kinds of black holes in the universe that we know of the Stellar Mass black holes formed from massive stars and super massive black holes which live at the hearts of galaxies about one in a thousand stars have enough Mass to become a black hole when they die our Milky Way has 100 billion stars which means it could have up to 100 million... Read More

Key Insights

• 🖤 Stellar Mass black holes can potentially number in the millions in our Milky Way.
• 🖤 Super massive black holes, like Sagittarius A*, have relatively inconsequential mass compared to the galaxy.
• 🖤 Dark Matter, potentially linked to primordial black holes, accounts for over 3/4 of the universe's mass.
• 🖤 The universe could eventually be dominated by black holes if dark matter is mostly composed of them.

Questions & Answers

Q: What are the two types of black holes in the universe?

The two types are Stellar Mass black holes from massive stars and super massive black holes at galaxy centers.

Q: How does the mass of super massive black holes compare to the Milky Way's mass?

Super massive black holes, like Kevin (Sagittarius A*), constitute a tiny fraction, about 1/700,000, of the Milky Way's mass.

Q: How might dark matter be related to black holes?

Dark matter, potentially primordial black holes, could explain a significant portion of the universe's mass composition through gravitational influence.

Q: What is Stephen Hawking's prediction about the eventual fate of black holes?

Hawking predicts that black holes will slowly evaporate over time, with smaller ones disappearing in 10^66 years and super massive ones enduring longer.

Summary & Key Takeaways

• Stellar Mass black holes form from massive stars, potentially leading to millions in our Milky Way.

• Super massive black holes, like Kevin (Sagittarius A*), reside at galaxy centers and are relatively insignificant in mass scale.

• Dark Matter, potentially primordial black holes, could significantly impact the universe's composition.