Curiosity rover discovers opal gems on Mars with clues to watery past
Opals, which contain a lot of water, have been found on Mars. They might be an indicator of past life and possibly a source of water for astronauts in the future.
TroibNews 
Opals, which contain a lot of water, have been found on Mars. They might be an indicator of past life and possibly a source of water for astronauts in the future.
