If you want to know more than one thing, you need more than one sensor. In fact, many engines today have not just two oxygen ...
India Today on MSN
Chandrayaan-4: Why India's next Moon mission is changing rockets mid-way
Isro is changing the launch vehicle for Chandrayaan-4. The engine it now depends on has never flown.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results