Its a boomtube portal which is similar to thor's bifrost portals, which are temporary, I dont think it will remain open like the alien portal in Avengers but i could be wrong... Boomtube portals aren't usually permanent portals that need to be blown up to be closed
"The initial Kirby comics depict boom tubes as a sort of quasi-technological equivalent of Bifrost, the Rainbow Bridge linking Asgard and Earth; indeed, boom tubes are described as a "bridge to Earth." Subsequent writers have allowed the tubes to be used for point-to-point transport between various locations on New Genesis, Apokolips, Earth and other planets, thereby making them near-ubiquitous for the travel of the New Gods. Boom tubes replaced other mostly undefined concepts like the Electron Road, the Matter Threshold and the Star Gate, all of which have been used by the New Gods for travel from either New Genesis or Apokolips."
