Although creationism has been rejected in the field of science, it is true that human beings are "created" to some extent, except that this is not a conscious decision of a creator, but the product of various objective material conditions, in other words, it is not subject to the will of any living being, including human beings themselves.
In fact, even if human beings have developed all the way to today, with developed science and technology, we still have no way to completely synthesize a life by artificial, let alone a human being whose structure is very exquisite, and we need to rely on the power of nature itself to be able to do it anyway. So, will future humans do it? We are now clearly unpredictable.
It is precisely because human beings themselves are so well constructed that we can carry out such complex scientific research; but human beings themselves also have many limitations, so we have no way to go directly to more distant space. Therefore, human beings decided to "learn from each other's strengths", use their own strengths to make up for their shortcomings, and create various tools to help them complete a series of things that are difficult to complete by pure physiological activities, such as flying into space.
But the current human race still has not reached our ideal level of development, such as our "eyes" can see objects tens of billions of light years away, but our flesh is still hovering in the solar system, even as far as our satellite moon.
< h1 class= "pgc-h-arrow-right" > speed in the universe</h1>
The first time we were able to break through Earth's gravity and atmosphere was in the middle of the last century, when our launch vehicle finally had enough power to reach the "first cosmic velocity", that is, the speed to get rid of the Earth's gravitational pull, and successfully brought the satellites into the Earth's orbit.
So, what kind of speed is there on top of this? There are also "second cosmic velocities" and "third cosmic velocities", when we reach the second cosmic speed, we can leave the earth's orbit and come to the orbit around the sun, becoming an "artificial asteroid" in the solar system. And if we reach the third cosmic speed, then even the gravitational pull of the sun will no longer be able to bind us, and we will be able to rush out of the solar system and reach a wider space.
In the 70s of the last century, humans launched the Voyager 1 and Voyager 2 probes, which are designed to explore distant planets and worlds beyond the solar system, but if its own speed reaches the third cosmic speed, there is not enough fuel to support the solar system, how do we break through this bottleneck?
The researchers used a very ingenious method, that is, to let the gravity of the planet provide itself with a "gravitational slingshot", and after approaching Jupiter, let its gravity provide a "reaction force" to itself, so that it can be "thrown out" outside the galaxy, thus achieving the effect of saving fuel.
<h1 class="pgc-h-arrow-right" > the fastest speed in the universe</h1>
Obviously, even human vehicles that use the "gravitational slingshot" cannot reach very high speeds, and Voyager 1 has not been completely separated from the solar system for decades, but has only reached the edge of the solar system. So, is there really any matter in the universe that can travel fast?
In fact, there is, and that is the fastest speed that matter in the universe can achieve - the speed of light. How fast is the speed of light? Measured in a unit we are more familiar with, it is close to 300,000 kilometers per second. If it is the speed of light, then the distance between the sun and the earth will only take about 8 minutes or more, which means that the sunlight we see now is actually emitted eight minutes ago.
Based on this speed, the researchers created new distance units, measured using the time it takes to travel light. Because for the vast universe, the distance units that humans usually use are too cumbersome and tiny. The "light year" we often hear is actually a unit of distance based on this theory, which refers to the distance at which light travels in the universe for a year.
So we can say that the distance between the sun and us is about 8 light minutes. With such units of measurement, the original "astronomical numbers" become understandable, such as the proximity of the closest star to the solar system, Proxima Centauri, which is 4.22 light-years away, while the entire Milky Way is about 100,000 light-years in diameter.
< h1 class="pgc-h-arrow-right" > the speed of light and time? </h1>
We can find in ordinary life that the faster the speed, the scenery we see is also different, because our vision has certain limitations, if the light signal transmits too fast, then our vision will become blurred. So some people wonder, if we can fly at the speed of light at 300,000 kilometers per second, what will the scenery we be able to see will look like?
This problem is not as simple as our visual signals, the first thing to understand is a series of theories of the famous physicist Albert Einstein. Relativity is one of Einstein's most important theories, which are divided into general relativity and special relativity, which addresses the problem of speed.
According to Einstein's theory, there is no way for any other matter in this universe to reach the speed of light except light itself. For no matter with a stationary mass of zero can reach the speed of light, but all matter except photons has a rest mass. And if the speed of light is reached, time will cease to exist.
This conclusion may come as a surprise to many people, but by the nature of time, it is a definition of the process by which matter changes, and the faster the speed of matter, the slower the time it goes through. Because the speed of light itself is the fastest speed in the universe, if we look at it from the point of view of light, then time is completely static.
That is to say, although human beings use units such as "light years" to measure distances, in the light itself, they do not experience a year of time, not even a moment, because there is no concept of time at this speed.
That being the case, if we sit on a spaceship traveling at the speed of light, what does the external scenery that we can see look like, has it always been "stationary"? This is not the case, and scientists have already simulated the situation.