There is a great lot we do not know about the Universe. The matter that we know today and that is contained in all the stars, planets, asteroids and galaxies makes up for only about 5% of the Universe. What is called "dark matter" is everywhere, making up for about 27% of the Universe. It exerts gravitational force, because it holds galaxies together. Scientists suppose that it either might be made of some "exotic" particle, or that it may not exist at all! What is called "dark energy" then constitutes the remaining 68% of the Universe. It is distributed evenly throughout space and time, has no gravitational effects and is responsible for the acceleration of the expansion of our Universe. Scientists use the word "dark" for this matter and energy, because they are invisible phenomena, they are not understood, they are elusive and mysterious.
Looking at these proportions, the reality that science knows today is in fact only marginal and the majority of the Universe functions in a way which we do not understand. That is an awe-inspiring realisation. We are only aware of a fraction of what is going on in the Universe and the forces that govern our lives.
I am a humble user and fan of astrology. Astrology found me at a certain time point in my adult life. At first, I was extremely sceptical, because - well, that is how I was trained as a natural scientist. I was programmed to not believe it. But the astrological chart explained exactly what I was experiencing. I was partly shocked, partly relieved, because I had been feeling that something was lacking in my perception of reality. It was a real AHA moment in my life. I proceeded to approach astrology with the attitude of "I don't believe you, prove me wrong", but soon I was convinced. I embarked on the study of charts, matching what I was learning to read in them with the reality I was observing in my life and around me - and it fit! I had found a powerful tool to understand myself and the world around me.
Astrology, the study of the heavenly bodies and their influence on life on Earth, is as old as mankind. Stone age people, the ancient Mesopotamians, Egyptians, Africans, Persians, Greeks, Romans, Islamic civilisations, Indians and Chinese, pre-Columbian American civilisations, the Aboriginals and Pacific cultures, the Vikings and the European civilisation until the baroque times, all developed astrological systems which converge in many aspects. They defined constellations in the sky, constructed places of worship and other buildings in alignment with the positions of the stars and the movement of the Sun, marked auspicious days for activities and festivities depending on the position of the Moon, planets and stars, they derived human traits from celestial bodies and constellations and matched the charts of people for marriage, because it made sense and was tested and proven by time. In Renaissance Europe, astrology flourished as a science alongside astronomy and mathematics. Famous astronomers Tycho Brahe (1546-1601), Galileo Galilei (1564-1642) and Johannes Kepler (1571-1630) were well-known astrologers too.
Science by its definition on Wikipedia is "a systematic enterprise that builds and organises knowledge in the form of testable explanations and predictions about the Universe". To me this definition clearly postulates that astrology is a science today too. It is based on age-old empirical knowledge and observational evidence, explains reality and predicts events in the Universe. It is a complex and complicated science, no doubt, but the basics are relatively simple and easy to understand.
When we are born into this world, we become imprinted by the momentary configuration of the Universe around us - by the position of the horizon, the Sun, the Moon, the inner and outer planets and other, more distant celestial objects. How that happens is not clear (but see the beginning of this post). That is our natal horoscope, our universal and unique ID card which we carry with, or rather in, us for our entire lives.
Here is a little testable explanation for you: try and find someone whose natal Moon is conjunct (that means in the same position in the natal chart as) your natal Sun, or vice versa, and experience the feeling of natural affection that will produce. The Sun of the first person, standing for the personality, and the Moon of the other, standing for the emotions, will attract. Your entire interaction is more complex than that, of course, but this aspect will be felt by both of you. You can obtain your natal chart for free by entering your date, time and place of birth on the world's best astrology site, www.astro.com
 See, e.g.: https://home.cern/science/physics/dark-matter; https://webarchive.nationalarchives.gov.uk/ukgwa/20210603113151/https://stfc.ukri.org/news-events-and-publications/features/the-story-of-dark-matter/10-things-you-need-to-know-about-dark-matter/