source: The Great Dark Spot is thought to rspresent a hole in the methane cloud deck of Neptune.
target: The Great Dark Spot is thought to be a hole in the methane cloud deck of Neptune.
references: The Great Dark Spot is thought to be a hole in the methane cloud deck of Neptune. The Great Dark Spot is assumed to be a hole in the methane cloud deck of Neptune The Great Dark Spot is regarded as a hole in the methane cloud deck of Neptune. The Great Dark Spot is thought to represent a hole in the methane cloud deck of Neptune. The Great Dark Spot is thought to show a hole in the methane cloud deck of Neptune. The Great Dark Spot is thought to represent a hole in the methane. It is thought that the Great Dark Spot might be a hole in the methane cloud deck of Neptune.