How many?

Tonnes

The tonne is a metric unit of mass equal to 1,000 kilograms. It is also referred to as a metric ton to distinguish it from the non-metric unit. It is equivalent to approximately 2,204.6 pounds.

Solar Mass

The solar mass is a standard unit of mass in astronomy, equal to approximately 2×1030 kg. It is often used to indicate the masses of other stars, as well as stellar clusters, nebulae, galaxies and black holes. It is approximately equal to the mass of the Sun.