Voyager 1 and 2 in 1979
A number of space probes have visited Jupiter, including Pioneer 10 and 11, along with Voyager 1 and 2. Voyager 1 took some very detailed pictures of Jupiters spot in 1979.
Voyager
Jupiter's giant red spot is really just a giant storm and is sometimes nicknamed Jupiter's Red eye.
About 300 years (109,500 days)
It depends where you're looking from. I think its on the bottom left corner.
Both Jupiter's Great Red Spot and Neptune's Great Dark Spot are large, persistent storm systems in their respective atmospheres. They are both visible features on the planets that have been observed by telescopes and spacecraft. Additionally, both features are dynamic, changing in size, shape, and intensity over time.
one of jupiters features are that it surface is mostly made of hydrogen and helium
The Jupiter is BIG RED SPOT and a storm system
None. Saturn has a great white spot, Uranus has a dark spot. However, Neptune has a great dark spot [see related link for a picture] which has been compared to Jupiters great red spot, but it is not red.
Neptune's giant dark spot is a large storm system on the planet's surface that was first observed in 1989 by the Voyager 2 spacecraft. It is similar to Jupiter's Great Red Spot and has winds that can reach speeds of up to 1,500 miles per hour. The dark spot is thought to be a region of high atmospheric pressure that creates a darker appearance in contrast to the surrounding clouds.
The large hurricane on Jupiter is called the Great Red Spot. It is an enormous anticyclonic storm system that has been observed for over 300 years. This massive storm is larger than Earth and is characterized by its deep red coloration.
Jupiter's Great Red Spot is a massive storm, about 1.3 times the size of Earth in diameter, making it roughly 16,350 kilometers (10,159 miles) wide. It is a high-pressure region in Jupiter's atmosphere that has been raging for centuries.