source: The Great Dark Spot is thought to represent a hole in the methane cloud deck of Neptune.
target: The dark spot on Ne;tune may be a hole in the methane clouds.
references: The dark spot on Ne;tune may be a hole in the methane clouds. It is likely that Neptune's Great Dark Spot is a hole in the methane cloud deck. The Great Dark Spot is a hole in the methane cloud deck of Neptune. The Great Dark Spot is thought to be a hole in the methane cloud deck of Neptune. The Great Dark Spot is thought to be a hole in Neptune's methane clouds. The Great Dark Spot represents a hole in the methane cloud of Neptune. The Great Dark Spot is believed to be 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 represents a hole in the methane cloud deck of Neptune. The Great Dark Spot is a hole in Neptune's methane cloud.