Dark energy is a mystery substance believed to drive the expansion of space. Black holes are monstrous regions endowed with such powerful gravitational pull that material relentlessly falls inward. White holes are hypothetical time-reversed versions of black holes, in which material relentlessly streams outward. Together, these ideas–ranging from confirmed to highly speculative–extend Einstein’s vision of reality and advance our understanding of fundamental physical law. Join renowned researchers to explore the wondrous implications of gravity pushed to the extreme.