Atmospheric entry refers to the process when an object, such as a spacecraft or meteor, travels from space into the Earth's atmosphere. As it descends, the object encounters increasing air resistance, which generates intense heat due to friction. This heat can reach thousands of degrees Celsius, requiring protective materials, like heat shields, to prevent the object from burning up. During atmospheric entry, the angle and speed of the object are crucial for a safe descent. If the angle is too steep, the object may experience excessive stress and break apart. Conversely, a shallow angle can cause it to skip off the atmosphere, similar to a stone skipping on water.