there is no known planet with a breathable atmosphere for humans in our solar system or any exoplanet (a planet outside our solar system) that has been confirmed to have a breathable atmosphere.
The conditions required for a planet to have a breathable atmosphere, similar to Earth's, are complex and include factors such as the right mixture of gases, appropriate temperature range, and sufficient atmospheric pressure. These conditions are critical for sustaining human life as we know it.
In our solar system, Earth is the only planet known to have an atmosphere that supports human life. The atmospheres of other planets in our solar system, such as Venus, Mars, and the gas giants like Jupiter and Saturn, have compositions and conditions that are inhospitable for humans.
When it comes to exoplanets, scientists have made significant advancements in detecting and characterizing exoplanets in recent years. However, determining the detailed composition and habitability of their atmospheres is a challenging task, especially for smaller, rocky planets like Earth. Currently, the search for exoplanets with potentially habitable conditions is an active area of research, but no confirmed exoplanet has been found to have a breathable atmosphere for humans.
It's important to note that scientific discoveries and advancements are continually being made, and our understanding of the universe is constantly evolving. Future research and technological advancements may bring us closer to identifying potentially habitable exoplanets with breathable atmospheres.