Audio Guide：

The space is full of dust and ice crystals. Some of them have existed since the birth of the Solar System. Some are debris generated by comets or asteroids that collapse upon heat or impact. As they pass near the Earth, Earth’s gravitational pull cause them to fall at high speeds. In the process, frictions with the atmosphere create a trail of burning lights and create the meteors we observe. These objects are called meteoroids before they enter Earth’s atmosphere. Meteors appearing in groups are called meteor showers. Meteor showers are better observed after midnight because they appear in greater numbers and at a higher speed.