Space may appear to be an endless empty void, but it is actually filled with a variety of substances and forms of energy that make up the universe. From stars and planets to invisible forces that scientists are still trying to understand, space is a complex and fascinating place.The universe contains ordinary matter, which includes everything we can see, such as stars, planets, moons, asteroids, and galaxies. Ordinary matter is made up of atoms, with hydrogen and helium being the most abundant elements in the cosmos. These elements form the building blocks of stars and many other celestial objects.The regions between stars are not completely empty. They contain vast clouds of gas and dust known as nebulae. These clouds play an important role in the life cycle of stars, serving as the birthplace of new stars and planetary systems. Interstellar gas and dust also help shape the structure of galaxies.Scientists estimate that ordinary matter accounts for only about 5 percent of the universe. A much larger portion, approximately 27 percent, is made up of dark matter. Although dark matter cannot be seen directly because it does not interact with light, its gravitational influence can be observed in the movement of galaxies and other cosmic structures.An even greater mystery is dark energy, which makes up about 68 percent of the universe. Dark energy is believed to be the force responsible for the accelerating expansion of the universe. Despite its significant impact on the cosmos, scientists still do not fully understand its nature.Space is also filled with electromagnetic radiation, magnetic fields, and high-energy particles known as cosmic rays. These components constantly travel through the universe and contribute to the dynamic environment of space. Even the vacuum of space contains tiny particles and energy fluctuations, proving that space is never truly empty.In conclusion, space is composed of ordinary matter, interstellar gas and dust, dark matter, dark energy, radiation, and various forms of energy. While remarkable discoveries have revealed much about the universe, many questions remain unanswered. Exploring what space is made of continues to be one of humanity’s greatest scientific endeavors, offering new insights into the origins, structure, and future of the universe.