美股账户$300,000里程碑达成！AMD进一步减仓计划，聊聊MU, SNDK, SOXX等个股

[0:00]Hello, and welcome to our podcast. Today we have a very special guest, Dr. Emily White, a renowned astrophysicist from MIT. Dr. White, thank you for joining us. It's a pleasure to have you. Thank you for having me. It's a delight to be here and share some insights with your audience. Today, we're going to delve into the fascinating world of black holes. A topic that has captivated scientists and the public alike for decades. Dr. White, for those of us who might not be familiar, could you start by explaining what exactly a black hole is? Of course. A black hole is a region of spacetime where gravity is so strong that nothing, not even light, can escape. It's formed from the remnants of a large star that has collapsed under its own gravity. That's incredible. So, when we talk about a black hole, are we talking about a physical object, or more of a region? It's both. The singularity at the center is a physical point of infinite density, but the black hole itself is defined by its event horizon. Which is the boundary beyond which nothing can return. And what happens if something crosses that event horizon? Is it instantly gone? Once something crosses the event horizon, it's essentially on a one-way trip. It will be pulled towards the singularity at the center, experiencing extreme tidal forces. This process is often referred to as 'spaghettification,' where objects are stretched and compressed. Spaghettification! That's quite a vivid term. Are there different types of black holes? Yes, there are. The most common types are stellar-mass black holes, which are typically three to twenty times the mass of our sun. These are formed from the collapse of massive stars. Then we have supermassive black holes, which can be millions or even billions of times the mass of the sun. These are found at the centers of most galaxies, including our own Milky Way. That's astounding. So, the black hole at the center of our galaxy, Sagittarius A*, is a supermassive black hole? Precisely. Sagittarius A* has a mass of about four million times that of our sun. It's a fantastic natural laboratory for studying extreme gravity. And what about the recent images of black holes? How were scientists able to capture those? The images you're referring to, like the one of M87* and Sagittarius A*, were captured by the Event Horizon Telescope, or EHT. It's a global network of radio telescopes that work together as a single, Earth-sized virtual telescope. This allowed us to achieve the necessary resolution to image the shadow of a black hole. That's an incredible feat of engineering and collaboration. What do these images tell us about black holes? These images provide direct visual evidence of black holes and their event horizons. They confirm many predictions of Einstein's theory of general relativity in extreme gravitational fields. It's a testament to the power of scientific inquiry and technological advancement. It truly is. Dr. White, thank you so much for shedding light on these mysterious objects. It's been absolutely fascinating. My pleasure. I hope your listeners enjoyed learning about black holes as much as I enjoyed discussing them. And that wraps up another episode of our podcast. Join us next time for more exciting topics.