Lerner's ideas have been rejected by the professional physicists and cosmologists who have reviewed them. Some cosmologists think that string theory and brane cosmology will provide an alternative to inflation. Cosmologists often work with a given space-like slice of spacetime called the comoving coordinates. Redshift is directly observable and used by cosmologists as a direct measure of lookback time. This has caused cosmologists to abandon the oscillating universe model. Some cosmologists have whimsically called the effect associated with the "accelerating universe" the "cosmic jerk". Before observations of dark energy, cosmologists considered two scenarios for the future of the universe. Instead, cosmologists propose a new form of energy called dark energy that permeates all space. A substantial majority of cosmologists therefore believe the age problem is now resolved. Cosmologists estimate that the acceleration began roughly 5 billion years ago. Cosmologists often simplify this equation by defining a critical density, formula 9. These software are widely used by the cosmologists across the globe. Physical cosmologists who have commented on the book have generally dismissed it. AnalizeThis is a parameter estimation package used by cosmologists.