1. (cosmology) the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature
   - big bang theory

Type of: scientific theory

• phyletic
• Phyllidae
• phylliform
• phyllite
• Phyllitis
• Phyllitis scolopendrium
• Phyllium
• phyllo
• phylloclad
• Phyllocladaceae
• phylloclade
• Phyllocladus
• Phyllocladus alpinus
• Phyllocladus asplenifolius
• Phyllocladus trichomanoides
• phyllode
• phyllodial
• Phyllodoce
• Phyllodoce breweri
• Phyllodoce caerulea
• Phylloporus
• Shetland Islands
• Shetland pony
• Shetland sheepdog
• Shetland wool