CCD imaging of low-luminosity radio galaxies to detect the optical counterparts of radio jets is described in terms of the surface-photometry procedure and the results for two galaxies. The galaxies have low-power radio jets at the arcsec scale and appear to be interacting with companion galaxies. Interfering images are removed, and isophotal

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The way in which the effect of the instrumental polarization of a spectrograph can distort the shape of the intensity profiles in sunspots is shown empirically. A spectral region around a magnetically sensitive line and a sunspot away from the disk center were chosen. The resulting limitations which arise when trying to derive physically meaningful

In the present comparative study of published values for the scale lengths of spiral galaxies' exponential disks, the average value of the discrepancy for more than 120 galaxies is 23 percent, with a standard deviation of 20 percent. Neither systematic trends nor correlations of discrepancies with such galaxy parameters as morphological type, arm

Observations of the Jupiter were carried out using a refined version of the stellar seismometer with a sensitivity of better than 50 cm/s. The observations revealed the existence of strong velocity variations of the planets in the 10-20-min period range. It is concluded that the observed variations can only be explained as global acoustic modes