* Mega (M) means 1,000,000 (10^6)

* Nano (n) means 0.000000001 (10^-9)

To convert from megaseconds to nanoseconds, we do the following:

1. Start with 1 megasecond: 1 Ms

2. Convert megaseconds to seconds: 1 Ms * 1,000,000 s/Ms = 1,000,000 s

3. Convert seconds to nanoseconds: 1,000,000 s * 1,000,000,000 ns/s = 1,000,000,000,000,000 ns

Therefore, there are 1,000,000,000,000,000 (one quadrillion) nanoseconds in one megasecond.