The enormous expansions offered in GTA IV — The Lost and Damned and The Ballad of Gay Tony — saw great appraisal from critics everywhere, but didn't sell as much as hoped and expected;
bigger expansions usually mean they're more expensive, and according to Rockstar VP Dan Houser, «$ 10 is a more exciting price point.»
«During the past few years our group,» says David Jones, an astrophysicist at the IAC and another of the authors on the paper, «has discovered that the planetary nebulae with the
biggest discrepancies in their abundances are
usually associated with binary central stars which have been through a phase with a common envelope, that is to say the process of
expansion of the more massive of the two stars has meant that the other star is orbiting within its outer atmosphere, and the viscosity has brought the stars very close to one another.