Navigation in Space, Sizes of Black Holes and Planet 9 | Q&A 178

TL;DR

Fraser Cain answers viewer questions about black holes, galaxies, and the mysteries of the Universe.

Transcript

Fraser Cain: Hey, everyone, welcome to the question Show Your questions, my answers. As always, wherever you are, across my channel, have a question pops into your brain, just write it down, gather them up, and I will answer them here. Now, as always, I record this show every Monday at 5pm. Pacific time. So if you want to catch the show live, you c... Read More

Key Insights

• 🖤 Black holes are measured by mass and spin, with their size defined by the event horizon.
• 🌥️ Galaxies' filaments are interconnected by dark matter, shaping the large-scale structure of the Universe.
• 🛰️ Stability in orbits is maintained by the balance between gravitational forces and the momentum of orbiting objects.
• 🤩 Dyson Spheres require careful design to prevent collapse or drifting into stars due to gravitational and solar radiation forces.
• 📌 Gaia spacecraft is revolutionizing our understanding of the Milky Way's shape and our location within it.
• 👨‍🔬 Theoretical concepts like the Dark Force Theory and the Great Filter add intrigue to the search for extraterrestrial life.
• 💩 Rubble pile asteroids may have originated from remnants of comet-like structures stripped of volatile elements.

Questions & Answers

Q: How do astronomers measure the size of black holes?

Astronomers rely on the mass and spin of black holes to calculate the size of their event horizon, the point beyond which nothing can escape their gravitational pull.

Q: Why do galaxies in the Universe appear as interconnected filaments?

Galaxies are tied together by dark matter, forming large-scale structures in the Universe due to variations in density during the early Universe's formation.

Q: What makes orbits stable in the Solar System?

Orbits are stabilized by the gravitational pull of celestial bodies, balancing the forces of motion with gravity to maintain stable paths around a central star.

Q: How do Dyson Spheres maintain stability around stars?

Dyson Spheres face challenges in stability due to gravitational forces and solar radiation, requiring careful engineering to prevent collapse or drifting into their parent stars.

Summary & Key Takeaways

• Black holes are primarily measured by their mass and spin, with their size being defined by the event horizon.

• Astronomers measure celestial objects using right ascension and declination, similar to latitude and longitude in space.

• Gaia spacecraft is revolutionizing our understanding of the Milky Way's shape and our location within it.