The image is a diagram that shows the structure of a comet. It is a circular diagram with a black background and white text. The diagram is divided into three sections.

The first section is labeled "Structure of a Comet" and shows the dust tail of the comet. The dust tail is located on the left side of the diagram and is responsible for the formation of the sun. The sun is located in the center of the image and is surrounded by a cone-like structure. The cone is labeled with the names of the different types of dust tails, such as "ion tail", "ion gas", and "nucleus".

There are also two arrows pointing towards the cone, one labeled "The Sun" and the other labeled "Comet's trajectory". The arrows indicate that the comet's trajectory is towards the sun, which is located at the bottom of the cone. The image also has Chinese characters on it, which likely provide further information about the structure and its purpose.