Space has almost irrational dimensions. To give you an idea, the distance from the Earth to the Sun is close to 150 million kilometers. Other bodies are so distant that the speed of light has become the standard measure for determining their distance.
Let's understand,
The speed of light was already a subject of discussion in antiquity, and for many centuries it seemed there was an understanding of values very close to what science claims today. It has always hovered around 300,000 km/s; today, the value is 299,792,458 meters per second in a vacuum.
Thus, an object A that is 299,792,458 meters away from an object B is 1 light-second away from it.
Therefore, 1 light-second is 299,792,458 meters.
A "light-year," a more popular measure, is approximately 10 trillion kilometers (10,000,000,000,000,000 meters).
The Moon, the closest celestial body to Earth, is between 356,577 km and 406,655 km away (this variation occurs due to the satellite's elliptical, rather than circular, trajectory around our planet). Therefore, it is close to 1 light-second away from Earth.
To travel through the Universe, we are called upon to solve this problem: overcoming distance.
However, even theory, especially regarding the 'inertia of energy', demonstrates that it is impossible to reach the speed of light, and even if it were possible, how could we reach bodies that are millions of light-years away?
We are accepting suggestions...
(In the illustration for this article, you can see a solar sail, a theoretical spacecraft that illustrates the Star Wars saga)
