... Aurora Over Alaska . ... 560 Kilometers Above Europa . ... In a meeting in California two weeks ago, unpublished results were presented indicating that most of the energy in our universe is not in stars or galaxies but is tied to space itself. ... Interstellar space is filled with extremely tenuous clouds of gas which are mostly Hydrogen. ... EGGs, short for evaporating gaseous globules, are dense regions of mostly molecular hydrogen gas that fragment and gravitationally collapse to form stars. ...