Solar System And Beyond - Astronomy: The

Modern astronomy also grapples with the invisible. "Normal" matter—the stuff that makes up stars, planets, and people—accounts for only about 5% of the universe. The rest is composed of dark matter, which provides the gravitational scaffolding for galaxies, and dark energy. Understanding these components is the "frontier" of modern physics. Conclusion

Stellar evolution is the engine of the universe. Stars are born in vast clouds of gas and dust called nebulae. Through nuclear fusion, they convert hydrogen into helium, releasing the energy that illuminates the cosmos. The fate of a star is determined by its mass: while stars like our Sun eventually expand into red giants and fade into white dwarfs, more massive stars end their lives in spectacular supernova explosions. Astronomy: The Solar System and Beyond

Beyond the planets lies a graveyard of celestial building blocks. The Asteroid Belt, the Kuiper Belt, and the distant Oort Cloud house millions of small bodies that provide a "fossil record" of the early Solar System. Studying these objects, alongside missions to Mars and the moons of Jupiter and Saturn (like Europa and Enceladus), allows scientists to understand the conditions that led to the emergence of life on Earth and the potential for life elsewhere in our own backyard. The Life and Death of Stars Modern astronomy also grapples with the invisible