False-colour extreme ultraviolet image of the solar disc & a huge solar prominence, recorded by the Skylab space station in 1973. The disc of the Sun (left) was recorded at the 30.4 nanometre wavelength of radiation from helium atoms stripped of 1 electron. These atoms occur in the lower atmosphere, so the disc shows the clumpy distrib- ution of helium gas just above the Sun's visible surface - along with the prominence projecting half a million km (almost 50 Earth-diameters) at top. The 'ghost' images to left & right of the full disc were recorded at nearby ultraviolet wavelengths & show radiation from other atoms in the solar atmosphere. (More details on request). This picture is Fig. 2.1 in THE NEW ASTRONOMY & is described more fully on page 15 of that book.

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