What is a nebula? Detailed answer

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What is a nebula? Detailed answer

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What is a nebula?

If you've seen nebulae depicted in books as huge spirals, swirls, and clouds, don't expect to see anything like that in the sky. Most nebulae cannot be seen without a telescope. The word "nebula" came from the fact that they resembled foggy spots to astronomers who observed them through weak telescopes.

There are two main classes of nebulae - galactic and extragalactic. Galactic nebulae can be found in our galaxy (the Milky Way). They are made up of dust and gas. Extragalactic nebulae are located outside our galaxy. They are mostly made up of stars.

There are less than 2 galactic nebulae. This means that most of the nebulae known to man are located outside our Galaxy. How many? As far as we know, there could be millions of them in the vast expanse outside the Milky Way.

Extragalactic nebulae are also called "island universes" or "galaxies". This means that if someone were to observe our Galaxy from there, it would look like a nebula.

Extragalactic nebulae have different shapes. Some are irregular or elliptical in shape. Spiral nebulae are the most numerous. Spiral galaxies like ours are made up of many stars, huge clouds of gas, and vast areas filled with dust. The nebula usually has a core, from which processes diverge in a spiral. The Andromeda Nebula is the closest to Earth, the most extensive and the brightest of all known. It gives off 1 times more light than our Sun!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How is body temperature controlled?

In a room or building, a thermostat regulates the temperature by controlling the amount of heat produced by the heaters. In the human brain there is a region called the thalamus, which acts as a kind of thermostat. It controls the amount of heat in the body and keeps it at around 37 degrees Celsius. The body burns food and oxygen to obtain energy, primarily heat. Since the body produces heat all the time, it must have some way to get rid of its excess. Otherwise, it will get hotter and hotter.

The function of the thalamus-thermostat is to release some of the heat so that the body temperature remains constant. The air exhaled from the lungs takes some of the heat with it. Waste products, leaving the body, also take some heat with them. More of it comes out through the skin. It constantly releases heat from the body and that is why it always remains warm to the touch. The thalamus can cause the skin to give off more than normal heat, and less, if necessary. If the body gets too hot, more blood than usual rushes to the surface of the skin. As a result, more heat comes to the surface of the skin from the internal organs and, accordingly, more leaves the body into the air surrounding it.

On the other hand, if the body cools down, the capillaries under the surface of the skin constrict - and the blood flow here decreases. And the less blood circulates at the surface of the skin, the less heat it gives off. If our body gets too hot, we start to sweat. Sweat is a brackish liquid produced by the sweat glands. From these glands to the pores on the skin are thin tubes through which sweat enters the surface of the skin. There it evaporates, accelerating the release of heat by the body.

Moisture turns into gas and escapes into the air, taking with it the excess heat. This is why you feel colder when your skin is damp than when it is dry.

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Smart toothbrush ISSALEXA 31.03.2018

Foreo has unveiled ISSALEXA, an artificial intelligence toothbrush that can speak and express emotional support to its owner.

The novelty will help save money on a psychologist and become a life mentor.

ISSALEXA not only provides oral care with T-sonic sonic pulsation technology. Its feature is the ability to determine the mood of a person and maintain it with the help of voice phrases during morning or evening brushing of teeth. This was made possible thanks to the innovative development of Foreo - "Emotional artificial intelligence" analyzes a person's saliva and determines his internal state.

Within 5 months, a group of Foreo scientists at their own institute conducted clinical trials with more than 100 patients and found that human saliva studies can determine their physical and emotional health.

Based on the data obtained, the company created ISSALEXA. The novelty is able to analyze the saliva of the owner of the device and, at the slightest deviation from the norm, determines his emotional state. In addition, thanks to artificial intelligence, ISSALEXA speaks and finds the right words of support when needed.

For more personalization, any owner of the novelty can fill out a short questionnaire on the site foreo.com to increase the intelligence of their own ISSALEXA. Also on the site, you can synchronize your calendar with the device so that the toothbrush knows about the owner’s plans and reminds you of brushing your teeth.

“Being first is what keeps us moving forward,” said Paul Peros, CEO of Foreo. “Foreo products are out-of-the-box, and now we are taking it to the next level and applying artificial intelligence and speech technology to brand innovations. not only to create the most effective beauty and health devices, but also to offer our clients extra emotional support when they need it."

ISSALEXA is presented in 4 shades: black and cobalt blue - for men, soft pink and mint - for girls. The cost of ISSALEXA is 300 USD.

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