The Voyager probes, Voyager 1 and Voyager 2, were launched in 1977 and have provided valuable information about the outer planets of our solar system, including Jupiter and Saturn. However, neither probe has visited or is currently heading towards Neptune, Uranus, or any other planet beyond Saturn.
Regarding the potential for human survival on these planets, it's important to note that the outer planets of our solar system are inhospitable environments for human life. Here are a few reasons why:
Extreme temperatures: The outer planets are characterized by extremely low temperatures. For example, Uranus and Neptune have average surface temperatures of around -200 degrees Celsius (-328 degrees Fahrenheit). These frigid conditions would make it impossible for humans to survive without advanced protective gear and technology.
Lack of breathable atmosphere: The atmospheres of the outer planets consist primarily of hydrogen, helium, and trace amounts of other gases. They lack a significant amount of oxygen, which is essential for human respiration. Breathing the atmospheric composition of these planets would be fatal for humans.
Harsh atmospheric conditions: The atmospheres of the outer planets are characterized by extreme pressure, strong winds, and violent storms. For instance, Neptune has the fastest winds in the solar system, reaching speeds of up to 2,100 kilometers per hour (1,300 miles per hour). Such conditions would pose significant challenges to human survival.
Lack of solid surfaces: The outer planets are primarily composed of gases and do not have a solid surface like Earth. Instead, they have dense atmospheres surrounding a core of rock and ice. This lack of solid ground would make it difficult to establish settlements or support human life as we know it.
Given these factors, it is highly unlikely that humans could survive on any of the planets visited by the Voyager probes or those located beyond Saturn. The harsh environments, extreme temperatures, lack of breathable atmospheres, and absence of solid surfaces make these planets unsuitable for human habitation without extraordinary technological advancements.