Assuming that 100,000 kg biomass supports one human, the asteroids may then sustain about 6e15 (six million billion) people, equal to a million Earths (a million times the present population).[citation needed] Similar materials in the comets could support biomass and populations about one hundred times larger.[citation needed] Solar energy can sustain these populations for the predicted further five billion years of the Sun. These considerations yield a maximum time-integrated BIOTA of 3e30 kg-years in the Solar System. After the Sun becomes a white dwarf star,[21] and other white dwarf stars, can provide energy for life much longer, for trillions of eons.[22] (Table 2)