Starship Price Revolution, Space VS Mass Media, Galaxy Collisions | Q&A 213 | Summary and Q&A

TL;DR

This week's question show explores topics such as direct collapse black holes, galaxy mergers, communicating with alien civilizations, and the future of space exploration.

Key Insights

• 🫢 Black holes can form directly from the collapse of gas in the early universe, but the challenge lies in preventing the gas from heating up and creating outward pressure.
• 🤩 In galaxy mergers, stars in the galaxies pass by each other without colliding, while the gas and dust collide and merge to form a new giant elliptical galaxy.
• 👽 Communicating with alien civilizations would require a common language based on fundamental constants in nature.
• 👨‍🔬 Major research areas in astrophysics include large surveys of the universe, time domain astronomy, and multi-messenger astronomy.
• 🧑‍🏭 Starship, if successful, could potentially reduce the cost of launching payloads into orbit by a factor of 10 or more.
• 🌟 The visibility of stars is best in areas with low light pollution, such as Mauna Kea in Hawaii, the Atacama Desert in South America, and the Australian Outback.
• 🖤 Detecting the spin of black holes is possible through the interactions of their accretion disks.
• 🙂 Science communicators often emphasize the impossibility of faster-than-light travel, but some people still hope for its development.
• 😀 The survival of humanity beyond the next thousand years is uncertain, given the various existential threats we face.

Transcript

could black holes collapse directly in the early Universe when galaxies Collide how do their Stars Stay Together how would we communicate time to an alien civilization all this and more in this week's question show time once again for the question Joe your questions my answers now as always wherever you are across my channel if you're watching the ... Read More

Questions & Answers

Q: Can black holes collapse directly in the early universe?

Yes, it is possible for black holes to form directly from the collapse of gas in the early universe, without the need for a star to go through its life cycle. However, the challenge lies in cooling the gas and preventing it from heating up and creating outward pressure.

Q: What happens to stars when galaxies collide?

When galaxies collide, the stars in the galaxies pass by each other without colliding. Instead, it is the gas and dust that collide and merge, eventually forming a new giant elliptical galaxy.

Q: How would we communicate with an alien civilization?

Communicating with alien civilizations would require finding a common language based on fundamental constants in nature, such as the duration of radiation corresponding to the transition between hyperfine levels of an atom. These constants can be used as a basis for measurement and communication.

Q: What are some major areas of research in astrophysics?

Major areas of research in astrophysics include large surveys of the universe, time domain astronomy, and multi-messenger astronomy. Large surveys gather data from telescopes to examine a wide range of celestial objects. Time domain astronomy focuses on studying the changes and events occurring in the universe over time. Multi-messenger astronomy combines different methods of observation, such as electromagnetic waves and gravitational waves, to gain a better understanding of astronomical objects.

Summary & Key Takeaways

• Black holes can form directly from the collapse of gas in the early universe, without the need for a star to go through its life cycle. However, the challenge is to cool the gas and prevent it from heating up and creating outward pressure.

• In galaxy mergers, the stars in the galaxies pass by each other without colliding. Instead, it is the gas and dust that collide and merge, eventually forming a new giant elliptical galaxy.

• Communicating with alien civilizations would require finding a common language based on fundamental constants in nature, such as the duration of radiation corresponding to the transition between hyperfine levels of an atom.

• Astrophysics research extends beyond popular topics like black holes. Major areas of study include large surveys of the universe, time domain astronomy, and multi-messenger astronomy.