Atoms. Elements. Compounds. Light. Electricity. The physical sciences hold so many wonders to explore! From the Aurora Borealis to Newton's Laws of Motion, find out more about what the universe is made of and how it all works. Find out about metals that explode when they come in contact with water, and how hot air balloons fly. Plus, hear from Britannica Experts about their work in physical sciences, including engineering, physics, and more.