  Hydrogravitional-dynamics (HGD) cosmology of Gibson/Schild 1996 predicts that
the primordial H-He^4 gas of big bang nucleosynthesis became
proto-globular-star-cluster clumps of Earth-mass planets at 300 Kyr. The first
stars formed from mergers of these 3000 K gas planets. Chemicals C, N, O, Fe
etc. created by stars and supernovae then seeded many of the reducing hydrogen
gas planets with oxides to give them hot water oceans with metallic iron-nickel
cores. Water oceans at critical temperature 647 K then hosted the first organic
chemistry and the first life, distributed to the 10^80 planets of the
cosmological big bang by comets produced by the new (HGD) planet-merger star
formation mechanism. The biological big bang scenario occurs between 2 Myr when
liquid oceans condensed and 8 Myr when they froze. HGD cosmology explains, very
naturally, the Hoyle/Wickramasinghe concept of cometary panspermia by giving a
vast, hot, nourishing, cosmological primordial soup for abiogenesis, and the
means for transmitting the resulting life forms and their evolving chemical
mechanisms widely throughout the universe. A primordial astrophysical basis is
provided for astrobiology by HGD cosmology. Concordance {\Lambda}CDMHC
cosmology is rendered obsolete by the observation of complex life on Earth.
