We present internetwork quiet Sun spectropolarimetric observations taken simultaneously at the Fe I lines at 630 and 525 nm. The magnetometry at 630 nm in these low flux regions of the Sun's photosphere has been put in doubt by a recent work. The 525 nm lines are supposed to give reliable results concerning the magnetic field strength in regions

Spectropolarimetric observations of the internetwork obtained in the 1.56 [mμ]m Fe I doublet are used to calculate the distributions of magnetic field strength, filling factor and magnetic flux density at different positions on the solar surface. We go one step further and describe what the observations show about the three-dimensional structure of

The Orion Nebula (NGC 1976, M42) contains the nearest massive star forming region and is therefore ideal for studying the physical process accompanying star formation. The high spatial resolution available with HST imaging in emission lines and continuum permits highly detailed study of such processes, as has been described notably by O'Dell (2001)

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