Prompt: In the vast universe, planets like Saturn, Jupiter, the Moon and the Earth quietly orbit in their predetermined trajectories. Brave astronauts aboard spacecrafts and shuttles venture into the unknown space, with endless curiosity. They yearn to unravel one mystery after another, such as what information the visiting comets bring, and what secrets hide behind the planets. Scientists on the ground continuously study and analyze data from space, attempting to deduce the mysteries of the universe. Humans are tiny yet great, for they have the unyielding spirit of exploration, to understand the vast universe thoroughly.