It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radiation, and is the most important source of energy for life on Earth.

The Solar System[c] is the gravitationally bound system of the Sun and the objects that orbit it

Science 101 is a dynamic, curiosity-driven series that breaks down the principles, discoveries, and mysteries shaping our modern world. Each episode explores essential scientific concepts—from physics and biology to astronomy, technology, and environmental science—translating complex ideas into clear, engaging stories that anyone can understand. Designed for learners, thinkers, and lifelong explorers, Science 101 connects cutting-edge research with real-world relevance, showing how science influences daily life, global progress, and the future of humanity. Whether uncovering the secrets of the cosmos, examining the mechanics of the human body, or highlighting breakthrough innovations, Science 101 brings knowledge to life one discovery at a time. Hosted on Acast. See acast.com/privacy for more information.