c         = 2.99792458e8     # Speed of light (MKS)
G         = 6.67428e-11      # Gravitation constant (MKS)
Msun      = 1.98892e30       # Solar mass (kg)
Msuninsec = Msun * G / c**3  # Solar mass (secs)
Mpcinm    = 3.08568025e22    # Megaparsecs (m)
Mpcinkm   = Mpcinm/1000.0    # Megaparsecs (km)

