What are the difficulties of human exploration of the universe

The first difficulty is that the universe is so big that I forget who said it: astronomy is always a science of observation!

The second difficulty is that the gravitational pull of the earth is difficult to overcome. The recent mention of [space elevators] on the agenda may be a good way to address this issue.

The third difficulty is that the speed obtained by rockets with chemical energy is too small and too inefficient to be solved only by providing energy with controlled thermonuclear reactions and ejecting particles at close to the speed of light, which will take about decades.

The last and fourth difficulty is that the individual life span of human beings is too short, which is a biological problem, and perhaps freezing is a method that can lead to research results.

As mentioned above, UFO cannot be true is another inevitable conclusion. Because our difficulties are also theirs, the most likely scenario is to contact them by radio first and then visit them.

Huge span of space!

The difficulty of human exploration of space is that there is no gravity in space, and humans cannot walk in space normally. In addition, there is no oxygen in space, and human exploration of space can only rely on spacecraft to store oxygen, and cannot produce oxygen and breed animals and plants in space. In addition, mankind currently lacks warships that can travel through space at high speed and go out of the galaxy.

It can take hundreds of years, and exploration is slow.

Space is the cosmic space outside the Earth's atmosphere, the entire space outside the atmospheric space. Physicists divide the atmosphere into 5 layers: the troposphere (up to 10 km above sea level) and the stratosphere.

10 40 km), mesosphere (40 80 km), thermosphere (ionosphere, 80 370 km) and outer atmosphere (ionosphere, above 370 km).

About 3.4 percent of the atmosphere above the Earth is in the troposphere and 97 per cent below the stratosphere, the outer edge of which is the maximum limit for aircraft to fly with air support. Some high-altitude rockets can enter the middle layer.

Sputnik. The lowest orbital is within the thermoforming layer, and its air density.

is 1% of the Earth's surface. Air continues to exist at altitudes of 10,000 km, and there are still airborne particles even at altitudes of 100,000 km.

In ancient China, there was astronomical knowledge and the concept of the universe: the upper and lower four directions were called the universe, and the universe was called the universe throughout the ages, collectively known as the universe. Before the astronomical telescope, the naked eye observed the sky, people had a telescope, more and more understanding of the sky, the discovery of the solar system, shook the geocentric theory, affirmed the heliocentric theory, further discovered, the solar system is not the only one, the discovery of the Milky Way, and further discovery, the Milky Way is not the only one, the discovery of galaxy clusters, the universe can not see the edge, how big is the universe, it is said that it has a history of 13.9 billion years, and the diameter of 92 billion light years is so big.

This is not directly observed, because it is impossible for the human eye to see the 92 billion light-years of the universe at the speed of light. Human beings can't fly out of the solar system yet, don't think about it directly, we are too small in the huge universe to be absolutely invisible. We can imagine that if the germs in us rebel, we will suppress and exterminate them, and we will not allow them to take our lives.

The little lives on the electrons in our bodies, they have little impact on us, dreaming of flying out of the electrons and exploring the huge universe [human body], can microorganisms smaller than bacteria run all over our bodies? Whimsical, too powerless. The image of the universe composed of human beings based on the observation of billions of years and more than 10 billion years can also be said to be a false universe map.

The real universe can never be known.

Solar system. <>

Galaxy. <> universe.

The purpose is to broaden one's horizons, and the resources on the earth are limited, and the increasing population makes the resources continue to be strained, and exploring the universe is also to find another survival base suitable for human beings.

Difficulties: 1. The universe is vast.

2. The gravitational pull of the earth is difficult to overcome.

3. The speed obtained by the fire of chemical energy is too small and too inefficient, and can only be solved by providing energy with controlled thermonuclear reactions and at close to the speed of light or by detecting the ejected particles.

4. The individual life span of a human being is too short.

5. The internal reason is the lack of rate of return, unable to concentrate the best talents and the highest investment.

6. The external cause is the backwardness of energy utilization and exploration methods.