The starry sky is vast, an endless mysterious region, that even the most formidable and unimaginably powerful sentient civilizations would fail to fully explore!
When it comes to space travel, distance always poses the greatest challenge.
Even between companion stars, the unit of distance is often light-years. Light itself, with a speed of three hundred thousand kilometers per second, requires more than a year to traverse this distance. And this is the closest astronomical unit in the starry sky. If one were to measure the distance across the entire swath of stars in the galaxy, or even in the 'observable universe', the vastness is enough to plunge every sentient species into despair!
The distances, where even at light speed it takes tens, hundreds, or even millions of years are beyond imaginable for sentient life.