Models of the first star-forming clouds indicate that they had a temperature of roughly 180 K and a particle density of roughly 3.00×105 particles per cubic centimeter at the time they started trapping their internal thermal energy. Part A Estimate the mass at which thermal pressure balances gravity for these values of pressure and temperature. Mcloud = nothing kg Request Answer Part B How does that mass compare with the Sun's mass? Mcloud = nothing ⋅MSun Request Answer Part C What is the estimated lifetime of a star with that mass? Choose the answer that best fits your estimate Choose the answer that best fits your estimate About 10 billion years Greater than 10 million years Less than 10 million years About 1000 years