When six (6) or more Planet symbols appear in the reel, the Cosmic Spin feature is awarded, with three (3) initial Free Spins. 

Figure 1: 6 planet symbol appears 

All Planet symbols are stacked on top of each other, beginning at the bottom of the reels. If all positions in a column are filled with Planet symbols, the reel will grow a new blank symbol spot at the top, up to 6 symbol positions high.

Figure 2: 3 initial Free Spins awarded

The feature ends after all the respins are played, or the 6x5 reels filled with the Planet symbols, and the winnings accumulate in the win bar. Please note that the Spaceships are collected before the Planet symbols.