Thermal radiation is the emission of electromagnetic waves from the surface of an object due to its temperature. All objects emit thermal radiation, with hotter objects emitting more energy than cooler ones. This process occurs without the need for a medium, meaning it can happen in a vacuum, such as space. The most common example of thermal radiation is the heat we feel from the Sun. The Sun emits a wide range of electromagnetic radiation, including visible light and infrared radiation, which warms the Earth. This principle is also utilized in technologies like infrared cameras and thermal imaging.