1. Mars: The Martian atmosphere contains about 0.13% oxygen by volume. This oxygen is primarily produced through the photolysis of water vapor in the upper atmosphere by ultraviolet radiation from the Sun. Mars also has small amounts of oxygen trapped in its polar ice caps.
2. Venus: The Venusian atmosphere contains trace amounts of oxygen, estimated to be around 0.001% by volume. This oxygen is thought to be produced through photodissociation of carbon dioxide by solar radiation in the upper atmosphere.
3. Jupiter: The atmosphere of Jupiter contains a small amount of oxygen, estimated to be around 0.0004% by volume. This oxygen is primarily produced through the photolysis of water vapor in the upper atmosphere by high-energy radiation from the Sun.
4. Saturn: Saturn's atmosphere contains trace amounts of oxygen, estimated to be around 0.0001% by volume. This oxygen is thought to be produced through the photolysis of water vapor in the upper atmosphere by solar radiation.
5. Uranus: Uranus's atmosphere contains trace amounts of oxygen, estimated to be around 0.00001% by volume. This oxygen is thought to be produced through the photolysis of water vapor in the upper atmosphere by solar radiation.
6. Neptune: Neptune's atmosphere contains trace amounts of oxygen, estimated to be around 0.000001% by volume. This oxygen is thought to be produced through the photolysis of water vapor in the upper atmosphere by solar radiation.
It's important to note that the concentration of oxygen in these planets' atmospheres is significantly lower compared to Earth's atmosphere, which contains about 21% oxygen by volume. As such, these planets are not habitable for humans without the use of supplemental oxygen systems.
