The SCI FI Channel will premiere the new seasons of Stargate SG-1 and Stargate Atlantis this July, the network confirmed in a new on-air promo spot that premiered with tonight’s season finales.The summer premiere conforms to the network’s previous four Stargate premieres, since SG-1 moved to the cable network from Showtime.Then why is this newsworthy? This week the network announced that SCI FI Friday companion series Battlestar Galactica would not premiere its third season until October (story). The fall premiere of an original program is a first for the cable network, which traditionally has aired new episodes of its shows during the summer and winter — the big broadcast networks’ off-seasons.Learn more about SG-1 Season Ten and Atlantis Season Three in GateWorld’s episode guides, including spoilers for the season premiere of SG-1, “Flesh and Blood!”