First, we remind ourselves about powers of ten using this super video which starts at a Chicago lakefront picnic goes to the edge of the universe and to to the edge of atomic nuclei.

Powers of ten (1977 -- Eames Office)
**[link]**

Next, we remind ourselves about the kinds of light. This chart has very long wavelengths at the left end and very short wavelengths at the right end.

Big wavelength goes with small frequency and with small energy of each photon, The size of objects seen at each wavelength are nicely shown in the chart.

Each section of the spectrum needs a detector matched to the wavelength, frequency, and energy.

The next chart below has very short wavelengths at the left end and very long wavelengths at the right end.

The bottom scale in this second chart can be a bit confusing. The wavelengths are given there in nanometers. "Nano" means ten to the minus 9 power, To compare with the first chart, subtract 9 from the powers of ten on the second chart.