When we were young, we would ask the parents if Chang’e is living on the moon. Is it a cute jade rabbit? Looking at the stars in the dark night sky, we will ask how many stars there are, even we will count them. From an early age, we still don’t know what a star is. We have already begun to imagine the starry sky. I hope that when I grow up, I can explore the mysterious world that seems to be looking up but never accessible. The sky or the vastness of the universe has aroused the curiosity and desire of countless people since ancient times.
In the modern times, we have used telescopes and various means of detection to see the fascinating nebula, the terrestrial planets in the livable zone, and the beautiful galaxies outside the Milky Way. We have discovered beautiful ripple due to the merger of black holes. We know the secrets of more and more stars, but this brings more questions, let us be more curious about the beautiful and mysterious starry sky. As the slogan we know is called: “Our journey is oceans of stars.”

The universe is so big, so mysterious and beautiful, our heart can’t help but think: I want to see, but it is bound to involve the issue of interstellar travel. The speed of the No. 1 passenger who has already flown out of the solar system has reached more than 60 kilometers per second, which is about two ten thousandths of the speed of light. At this speed, it reaches the nearest star system that is 4 light years away from the Earth. It takes 20,000 years, and considering that humans generally do not exceed 100 years of life, it is unrealistic to conduct interstellar travel at such a speed.square steel tubing for sale Since the speed of the existing aircraft is not good, if the technology develops in the future, the speed will not work. Regardless of the feasibility, let’s make a bold assumption: 50 years later, the speed of human aircraft reaches 100% of the speed of light. What is the situation when humans use this speed for interstellar travel? In the case of flying at the speed of light, it takes 4.2 years for humans to reach the neighboring star which located 4.2 light years from Earth, and it takes 8.6 years to reach the brightest star in the night sky, Sirius. It seems optimistic, but these are just stars that are very close to the sun. In light years, there are no more than two digits from the Earth. If you want to go further?
How far is it farther away? It is better to understand how big the universe is: the Milky Way is 160,000 light-years in diameter, and the most distant galaxies that humans have observed are more than 10 billion light-years away from the solar system. What is this concept? This means that we travel to the double-digit light-year distance around the sun, which is equivalent to we want go to the market but cannot leaving the house.

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