Much of what we know about the gas giants comes from the observations made with telescopes-with the ones that are present on the Earth as well as with the Hubble space telescope. They provide very clear pictures of the outer planets. Many pictures are transmitted to the Earth by the space probes. The most well known of these probes are Voyager 1 and voyager 2, which started in 1977. They flew in the direction of Jupiter and Saturn, where they took the first exact pictures of the Saturn rings. Voyager 2 then flew past Uranus and Neptune for a 'big tour' of the space taking advantage of the 'slingshot' effect of the gravitational force of Saturn. As of today, both the probes have left our solar system.
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