Cold knowledge about the universe that you don't know.

Gliese 436b is an exoplanet about the size of Neptune, 33 light years away from the Earth and located in Leo. Astronomers believe that there is an unusual water state on this planet, and it is precisely because of this strange state that the surface of the planet is covered with burning ice. The pressure on the planet keeps the ice layer solid, and the temperature on the surface of the planet as high as 822 degrees Celsius (439 degrees Celsius) makes the ice layer overheat and form steam, so the surface of the planet is in a state of water ice.

Illustration: Gliese 436b Concept Map Source: Baidu

What is the smell of the universe?

Although astronauts wear spacesuits, they can't smell space directly. However, after returning from the extravehicular activity, the astronauts found that the spacesuit gave off a unique smell, which smelled like burnt steak, hot metal and arc welding smoke. This smell may come from by-products produced by dying stars, and they are found everywhere in the universe.

Illustration: The butterfly nebula NGC 6302 formed by the death of a star was photographed.

Have an interstellar beer party?

In the constellation Aquila, which is 0/0000 light-years away from the Earth, there is an alcohol cloud, the diameter of which is 1000 times that of the solar system. The ethanol content is equivalent to 400 bottles of beer (400 bottles are equivalent to 400× 1024).

Illustration: Eagle Source: Baidu

nearest neighbors

The nearest galaxy to the Milky Way is Andromeda, which is only 2.5 million light years away. The Andromeda galaxy is 220,000 light-years in diameter, but its brightness in the dark is still not enough for human eyes to see. If the Andromeda galaxy is bright enough, it will look six times bigger than the moon at the full moon.

Illustration: Andromeda galaxy Source: Baidu

The compressed earth

When some giant stars collapse, the mass of the stars will collapse inward, and the volume will continue to shrink, reaching a certain level (that is, it must be smaller than the schwarzschild radius), and a black hole will be formed. The schwarzschild radius of the earth is less than 9 mm (one third of an inch). If the radius of the earth is compressed below 9 mm, our planet will become a black hole. And if you want a person to be a black hole, he needs to be compressed to a point smaller than a proton.

Source: Baidu

Jixing nursery

Although the birth and death of stars do not happen in an instant, in the universe, this process actually happens quite frequently. By observing the birth of stars and the activity of supernovae in the Milky Way, astronomers have come to the conclusion that about 275 million stars are born or die every day in the visible universe. In other words, about 654.38+000 billion stars are born or die every year.

Source: National Aeronautics and Space Administration.

Galaxy year

It takes 24 hours for the earth to rotate around its axis, that is, one day, while it takes 365 days to revolve around the sun, which constitutes one year. It takes 230 million years for the entire solar system to orbit the center of the Milky Way. The last time the solar system passed its present position, the earliest dinosaurs just appeared on the earth, and the evolution of flowering plants will have to wait 100 million years.

The milky way soaked in wine

The smell of the solar system smells like hot metal and burnt steak. What about the smell of the center of the Milky Way? According to the Max Planck Institute, the center of the Milky Way smells like raspberries and tastes like rum. The researchers found that ethyl formate (a key chemical component in raspberries and rum) is very common in the Milky Way.

I don't know whether to choose raspberries or rum. Let's soak raspberries in rum and have a party.

Source: Baidu

Quietly increase time

Do you wish you could spend a few more hours every day? Don't worry. The earth's rotation slows down every 100/ms 1.4 ms. When dinosaurs still existed on the earth, there were only about 23 hours a day. According to the research of NASA, in 1820, it took 24 hours for the earth to rotate, but now it has been reduced by 2.5 milliseconds.

Author: quora

FY: Lin Moqi

Please also get authorization for reprinting, and pay attention to maintaining integrity and indicating the source.