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Recent investigations of the Universe are based on observations in a
very wide range of electromagnetic spectrum, from radio waves with
photon energies ~10^-5 eV, up to very high energy gamma rays reaching
~100 TeV. In this last VHE domain (100 GeV ? 100 TeV) practically all
of our knowledge was collected in the few last years due to results of
the H.E.S.S. observatory at the southern hemisphere, and working
somewhat shorter MAGIC and VERITAS experiments at the northern
hemisphere. During my lecture I will present highlights of H.E.S.S.
observational results of cosmic sources (astrophysical particle
accelerators), such as e.g. supernova remnants, pulsar wind nebulae,
stellar binary systems, a central black hole in our Galaxy, or active
galactic nuclei. I will also mention application of TeV astronomy to
study some fundamental problems of physics and cosmology (quantum
gravity, nature of dark matter). A short information about the current
preparatory phase proceedings for the Cherenkov Telscope Array (CTA),
a new generation TeV gamma ray observatory, will complete the
presentation.
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