Lifetime on Main Sequence
	• L  M3.5     T  fuel / L = M/M3.5 = M-2.5 Example:  M=2 MSun      L = 11.3 LSun        T =1/5.7  TSun
														1  106
	O5						40			405,000
														11  106
	B0						15			13,000
														440  106
	A0						3.5			80
														3  109
	F0						1.7			6.1
														8  109
	G0						1.1			1.4
														17  109
	K0						0.8			0.46
														56  109
	M0						0.5			0.08