The largest of the low-pressure systems are the extratropical cyclones and the cold-core polar cyclones which lie on the synoptic scale which in meteorology is a horizontal length of 1000 km or more. The Warm-core cyclones are the tropical cyclones, mesocyclones, and the polar lows that lie within the smaller mesoscale. The Subtropical cyclones are intermediate in size. Cyclones have also been on other planets outside of the Earth, such as Mars and Neptune. For example the Great Red Spot of Jupiter and the Great Black Spot of Neptune.