Giga -anum ==1 billion years
Picosecond ==1 trillionth of a second ==10^-12
1,000,000,000 years x 365 days x 24 hours x 60 minutes x 60 seconds x 1,000,000,000,000 picoseconds==31,536,000,000,000,000,000,000,000,000 picoseconds ==3.1536 x 10^28 picodeconds - in scientific notation.
