From publisher blurb:
Spinning and tumbling between Mars and Jupiter, a vast conglomeration of asteroids and planetary fragments spread across millions of miles in the fifth orbital position around the Sun. The remains of the planet Eris, these stellar bodies range in size, speed, and trajectory. Though travelling through such chaos is dangerous, the mineral and archaeological wealth present within the ancient rocks make such voyages tempting and lucrative despite the risks.
The Asteroid Belt is by no means a dead zone, untouched by outside influences. The Belt is home to many: venture capitalists, pirates, criminals, xeno-archaeologists, and more inhabit the frozen surfaces and hollowed-out interiors of the asteroids of the Belt. These brave and foolish individuals face hardships unique to the region; though some survive and prosper, most accomplish neither.
The Asteroid Belt by Gabriel Garcia is a 24-page supplement for Rocket Age. In it you will find a gazetteer of some of the locations within the Asteroid Belt, from the treacherous but mineral-rich Fields of Golundria to the mysterious xeno-archaeology of Kalami Gru, describing each in detail alongside characters to encounter and plot hooks to investigate. There are also rules for four new organisations, new equipment and new creatures.