explanation: -2 x 10^2 = -0.02, so -1.7x10^308 = 0.000000...(a lot of zeros)...0000000017

4.94065645841246544E-324 through 1.79769313486231570E+308 for positive values.

4.94 x 10^(-2) = 0.0494, 4.94x10^324 = (positive) 0.0000000...(a lot of zeros)...000000494

that is, E5 means multiplying by 10 to the power of 5