Jupiter great red spot

Jupiter's Great Red Spot is a persistent anticyclonic storm, larger than Earth, observed for centuries.

About this subject

Jupiter's Great Red Spot is the largest known storm in the Solar System. It is a high-pressure anticyclone, with winds reaching up to 432 km/h. Its current diameter is about 16,000 km, large enough to swallow Earth whole. Located in the planet's southern hemisphere, the spot is visible even with amateur telescopes.

First recorded observations date back to 1665 by astronomer Giovanni Cassini. Whether the same storm has persisted since then or has been renewed is debated. In the 19th century, measurements indicated a larger size than today; observations show a slow shrinking, especially since the 2000s. Data from NASA's Juno probe reveal that the storm extends hundreds of kilometers below the cloud tops.

The reddish coloration puzzles scientists. It is believed to be caused by compounds such as phosphorus, sulfur, or complex hydrocarbons reacting with solar ultraviolet radiation. The temperature at the storm's center is slightly cooler than surrounding regions, contributing to its stability. Interaction with atmospheric jet streams keeps the storm confined.

Interestingly, the Great Red Spot is not permanent. Studies show it can change shape and intensity over time. Currently, it is becoming more circular and shrinking. Some simulations suggest the storm may disappear within decades, though this is uncertain. Juno continues to provide data to better understand this iconic phenomenon.

Frequently Asked Questions

Why is Jupiter's Great Red Spot red?

The red color likely comes from compounds like phosphorus, sulfur, or hydrocarbons reacting with solar ultraviolet radiation. The exact composition is still under study.

Is the Great Red Spot shrinking?

Yes, observations show the spot has been shrinking over recent decades. In the 19th century, its diameter was larger than today. Some models suggest it may disappear within decades.

How long has the Great Red Spot storm lasted?

The storm has been observed for at least 350 years, since 1665. It is unknown whether it is the same continuous storm or if it has been renewed. Studies indicate it can persist for centuries.