How do the children reject description of what sun is like?

The children in the poem reject the description of the sun as a "hot ball of burning gas" because they find it too simplistic and unimaginative. They want to describe the sun in more poetic and vibrant terms, using metaphors and similes to capture its beauty and power. For them, the sun is not just a scientific object, but a source of wonder and inspiration, and they want to honor its significance with their own unique descriptions.