It has been a long standing puzzle that the gas in the galactic
cneter shows very violent motion and warm temperature inspite of
the apparent lack of energy sources. I present in the talk that
there are two outstanding molecular loops of a few 100 pc height
from the nuclear disk. I shall interprete that these loops are
created by the magnetic floatation due to the Parker instability,
similar to the solar prominence, althgouh the size scale is 12
orders of magnitude greater in the galactic center loops. The
magnetci field strength is estimated to be 150 micro gauss from
the Alfven speed. These magnetic loops have profound implications
in star formation of this region since the molecular gas is
controlled by the flotation. The floated gas falls down to the
disk at a high velcoity of 30 km/s or more, creating strong
shocks and massive molecular clumps, candidates for massive
cluster formation. I will present fruther discussion on the
possible loop candidates in the other galaxies.