Is oxygen available on every planet of our solar system?

The answer is yes for all the rocky planets (like Earth, Venus, and Mercury. Not sure about gas giants like Jupiter, Saturn, Uranus, and Neptune). Rocks are generally made up of oxides of metals and non-metals like iron oxide, SiO2 and many more. read more

So that is bad news if you'd like to live on another planet in our Solar System. However, it does mean that if we ever find a planet around another star that has oxygen in its atmosphere, we can be fairly confident that there is life of some kind on that planet. This page was last updated on July 18, 2015. read more

The very nature of the terrestrial planets in our own Solar System would be much different had the oxygen to carbon ratio in the early solar nebula been somewhat lower than it was, because elements such as calcium and iron and titanium would have been locked up during condensation as carbides, sulfides and nitrides and even (in the case of silicon) partly as metals rather than silicates and oxides. read more

Venus is also the hottest planet in our Solar System, with a mean surface temperature of 735 K (462 °C/863.6 °F). This is due to the CO²-rich atmosphere which, along with thick clouds of sulfur dioxide, generates the strongest greenhouse effect in the Solar System. read more