Big thanks to my college bestie for inviting me to such a great night at a private winery. It was a mix of wisdom and style. I’ll never forget what she said: ‘It’s not just about the wine, but who you’re sharing it with.
Here’s to good talks, new faces, and friendships that last
An uncrewed Progress cargo spacecraft carrying food, fuel, and supplies is scheduled to lift off on a two-day flight to the @Space_Station on Wednesday, Sept. 9.
We will be broadcasting its launch and arrival live. How to tune in: https://t.co/yJ8ZtXpONn
AvGeeks, assemble!
MAX POWER lands in Florida on Nov. 7��8, with an F‑104 flyover by the Starfighters and NASA’s ER‑2 on static display. Get the details: https://t.co/1DVwblNmua
Women’s rights activists Gloria Steinem has died at the age of 92.
She was most known as a nationally recognised leader of second-wave feminism in the U.S.
The second law of thermodynamics says that the total entropy of a closed system cannot decrease. Entropy is a measure of how many microscopic states are possible in a system.
At first, black holes might seem to have very little entropy because they are described by only a few properties, such as their mass, charge, and angular momentum.
However, in 1972, physicist Jacob Bekenstein proposed that black holes should have entropy.
His argument was based on the second law of thermodynamics. If an object with entropy falls into a black hole, its entropy would no longer be directly accessible outside the black hole. If the black hole had no entropy of its own, this could lead to a decrease in the total entropy of the universe, which would conflict with the second law.
So, how much entropy does a black hole have?
In 1974, Stephen Hawking showed that black holes have a temperature and emit thermal radiation, now called Hawking radiation. This means that black holes have thermodynamic properties.
Using the relationship between energy, temperature, and entropy, physicists found that the entropy of a black hole is proportional to the area of its event horizon.
This result is known as the Bekenstein–Hawking formula:
S = A/4ℓₚ²
where S is the black hole's entropy, A is the area of its event horizon, and ℓₚ is the Planck length.
The important point is that black holes do not violate the second law of thermodynamics. Instead, they can contain an extremely large amount of entropy. For a given region of space, a black hole represents the maximum possible entropy allowed by known physics.
So, although a black hole looks simple from the outside, its entropy can be extremely large.
LIVE: Join us to watch today's spacewalk as @Astro_Jessica and @Soph_astro work on maintenance outside the International Space Station. https://t.co/esCf2kp0Ku
Check out this behind-the-scenes look at the performance of "Title Theme" from Mario Kart World, straight from the recording studio!
🎶 Listen now on #NintendoMusic: https://t.co/z0nYeabQOk
From @TheAthleticFC: Argentina staff and players are banned for a combined 21 games for brawling after their loss to Spain in the World Cup final. https://t.co/xKGJ4BBGTd