Antimatter (H-) is the secondary currency in MARS. It's obtained by creating quality content and helping make sure the game is played correctly. If you create appropriate questions and dispute inappropriate ones, you will receive Antimatter.
With the help of Antimatter, you can make your buildings more beautiful. This can be done after your buildings have reached their final level of evolution using GCoins. There are unique advantages in the game associated with improving your buildings in this special way.
The primary currency in MARS is the GCoin, and you can earn them by creating and answering questions. You will be rewarded GCoins if you create proper questions and answer the questions correctly. At the same time, Antimatter is the game's secondary currency and you can earn it by performing well in debates, creating appropriate questions, and helping keep the game clean.