Deljewitzki
Bio
Science is no national boundaries, but scholars has his own country
Stories (37/0)
NASA spacesuit leaks again, how dangerous is it? There have been astronauts who nearly drowned
In our impression, the United States seems to spend money "big", to complete the Apollo manned lunar landing program, almost all the country's efforts, huge human, material, and financial resources, and finally, in 1969 the first manned lunar landing was completed. After the manned lunar landing program, the United States also manufactured a reusable space shuttle. It seems that the financial strength of the United States, but sometimes also to repair, a device with decades, for example, the United States is now using the spacesuit has been more than 40 years.
By Deljewitzkiabout a year ago in Earth
Gas and Natural gas, what is the difference between them?
As the saying goes: open the door to seven things, firewood, rice, oil, salt, soy sauce, vinegar, and tea. As times change, the term firewood has become more and more unfamiliar to many friends who grew up in the city, the rural cook stove no longer exists, replaced by a variety of gas stoves and appliances. So what is the gas burning in the gas stove in the end? What is the difference between the gas, gas, and natural gas that we usually hear about?
By Deljewitzkiabout a year ago in Earth
48 dogs smoked 100 cigarettes a day to prove that smoking is harmless
Tobacco, the raw material of cigarettes, is a plant native to South America, as early as in the primitive stage of human society there is the behavior of chewing tobacco, Indians are the earliest smokers. 15-century European explorer Columbus in the discovery of the "New World of America", found that smoking tobacco in the Americas has been quite common. found that smoking tobacco in the Americas has been quite common, then tobacco was brought back to Europe, and was widely spread, and gradually spread around the world. The way people smoke tobacco, experienced from chewing tobacco, snuff, cigars, and pipe tobacco to the later cigarette.
By Deljewitzkiabout a year ago in Earth
Why do bats sleep upside down?
Bats: the flying mammals Bats are a very ancient animal, with the earliest fossil specimens of bats being 51 million years old. Although bats are somewhat bird-like in appearance, when they do not lay eggs or have feathers, they are unique mammals (Adopter). They are the only mammals in the world that can fly on wings, can echo-locate, have a superb immune system and excellent DNA damage repair, carry a large number of viruses without getting sick themselves, and have survived a long history of living for over 30 to 40 years, which is a high life expectancy in the small mammal world!
By Deljewitzkiabout a year ago in Earth
Will the ecosystem collapse if all mosquitoes become extinct?
Recently, a deputy to the National People's Congress proposed the total elimination of mosquitoes, this news has sparked a lot of discussions. Mosquitoes are very diverse, and some of them not only suck blood and give big bites, but the scary thing is that they can also carry many bacteria and viruses that spread a variety of crippling and highly fatal diseases by biting humans, such as yellow fever, malaria, dengue fever, Zika, encephalitis B, satyriasis and so on.
By Deljewitzkiabout a year ago in Earth
Neutron stars have a density of up to 100 trillion tons per cubic meter
Neutron stars are extremely dense planets in the universe. Even according to the most conservative estimates, the density of neutron stars can be as high as 100 trillion tons per cubic meter. I have to say that such a density is unimaginable. Why is there such a high density? Let's start by looking at how empty atoms are.
By Deljewitzkiabout a year ago in Earth
Where is the highest mountain in the solar system?
As the highest mountain on Earth, the great name of Mount Everest can be said to be known to all people on Earth, but in the solar system, the Earth is not the only planet with mountains, so on other planets in the solar system, is there a higher mountain than Mount Everest?
By Deljewitzkiabout a year ago in Earth
Is there a planet in the universe with a diameter of 1 light-year?
Does a planet with a diameter of 1 light year exist in the universe? One of the more common thoughts on this question is that it is not impossible to form a planet with a diameter of 1 light-year if there is enough matter, yet according to the laws of the universe as we know them, such a thing is simply not possible.
By Deljewitzkiabout a year ago in Earth
Peculiar crystals found in particles of the Chelyabinsk meteorite shattered by a UFO
There are a huge number of small objects in our solar system. They are very small in mass and usually fast in speed, and their orbits can easily become unstable due to the influence of other objects, so there are often some small objects crashing into the Earth.
By Deljewitzkiabout a year ago in Earth
The sun is quietly changing, leaving mankind with no more than 5 billion years
The sun is the source of all things on earth, it is because of the sun's light and heat, the earth can become a vibrant planet, however, the sun is not an eternal existence, with the evolution of the sun, one day, the earth will become no longer suitable for human survival, then the sun left human time how long it?
By Deljewitzkiabout a year ago in Earth
If there is a billion-year-old advanced civilization in the universe, how terrible would it be?
The scientific community generally believes that the universe was born about 13.8 billion years ago, and according to scientists' estimates, rocky planets were already prevalent in the universe about 10 billion years ago. And we all know that the Earth is a rocky planet, only the Earth is lucky enough to happen to have a series of natural conditions favorable to life, and because of this, life on Earth can live and eventually evolve into human civilization.
By Deljewitzkiabout a year ago in Earth