"Asgard is physically on Mercury, Alfheim on Venus. Together with Earth Genesis, these three comprise the higher worlds. Unlike the previous star map, the milky way galaxy is no longer on the same plane. The 9 planets have been divided into three sets of three planets separated by realms.
Our planets Mars, Jupiter, and Saturn are the middle worlds, while Neptune, Uranus, and Pluto comprise the lower worlds. We do not know the reason, but the realms are separated by the fabrics of space and time, and one cannot travel to another realm without going passing through the Géfyra.
There is one for each realm, they are the Zauberer bridge, Ritter gates, and Jaeger pass respectively. Each planet suffers from a time dilation discrepancy we believe the focal point to be Pluto but we have yet to prove the hypothesis. In simpler terms depending on which planet, you are on, time flows faster or slower.