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If sensitive enough, future missions for nuclear astrophysics will be a great help in understanding supernovae explosions. In contrast to coded-mask instruments, both crystal diffraction lenses and grazing angle mirrors offer a possibility to construct a sensitive instrument to detect γ-ray lines in supernovae. We report on possible implementations of grazing angle mirrors and simulations carried out to determine their performance. [ABSTRACT FROM AUTHOR]

The XMM-Newton Observatory offers unprecedented effective collecting area in the X-ray energy range 0.1-15keV, and excellent angular resolution. This combination allows a sensitivity in Deep Field observations bettered only by CHANDRA. The higher collection area makes XMM-Newton un-surpassed at amassing spectral data fir diagnosing the origin and evolution of faint source populations. [ABSTRACT FROM AUTHOR]