## 物理学：引力波

，其中

### 引力波的传播

，这表明引力波传播经过的测地线是零性的，即其传播速度是光速

## 物理学：暗能量候选者

• 宇宙学常数，$$\Lambda$$
• Quintessence，物态方程的参数 $$\omega$$ 在 0 到 -1 之间变化，是一个变量
• Phantom，物态方程的参数 $$\omega$$ 可以小于 -1，是一个变量
• Quintom，物态方程的参数 $$\omega$$ 可以等于 -1
• 修改引力模型？

## 物理学：An Epic Journey to a Black Hole to Give You Goosebumps

(238) An Epic Journey to a Black Hole to Give You Goosebumps – YouTube

A black hole is a mysterious place where the laws of physics people are familiar with stop working. Black holes appear when massive stars collapse under their own weight. The gravitational field of the newly formed object is so powerful that even light, including X-rays, can’t escape it. Every black hole has an invisible line-in-the-sand. Cross it – and you won’t be able to escape, even if you’re a beam of light. Beyond the point of no return, the gravity is just too strong. It’s called the event horizon.

There’s a black hole about 1,000 light-years away from the Earth. That’s almost 6 thousand, million, million miles. On the scale of the Universe, it’s right next door. More than four times the mass of our Sun, this medium-sized monster is surrounded by streams of gas. There are two stars nearby. Scientists think this newly discovered black hole might be the nearest to Earth. It’s also the only system with a black hole visible to the unaided eye. Good news – you’re going to visit it right now!

TIMESTAMPS:

• Nearest black hole to Earth 0:01
• International Space Station 0:53 🛰
• The Moon 1:20 🌙
• Mars 1:36
• Jupiter 2:02
• Saturn 2:17
• The Kuiper Belt 2:43
• The Oort Cloud 3:14
• ⚫ You reach your destination! ⚫ 3:50