This white paper briefly describes the astrophysics of ultra-compact binaries, with emphasis of the challenges and opportunities in the next decade.

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We present preliminary results of a photometric investigation on IC10 using data collected with ACS@HSTS and WFPC2@HST. We estimate the distance using the Tip of the Red Giant Branch (TRGB). According to current estimates, IC10 seems to be a member of the M31 group. By assuming the same distance for the two different pointings, the reddening shows

We present both space (ACS@HST: F814W, F606W, F475W) and ground-based (MEGACAM@CFHT: u*, g',i',r',z') photometry of the Galactic Globular Cluster (GGC) M92. Space data are located close to the cluster center, while the ground-based data cover one square degree around the cluster center. We investigate the ratios between Horizontal Branch (HB), Main

Since the seminal work of Penrose (1969) and Blandford & Znajek (1977), it has been realized that black hole spin may be an important energy source in astrophysics. The radio-loud/radio-quiet dichotomy in the AGN population is usually attributed to differences in black hole spin, with correlations between black hole spin and host galaxy morphology

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