Driven by the potential of large-scale structure (LSS) observations to shed light on the physics behind the accelerated expansion of the Universe, several...

One of the challenges in solar astronomical observations is the lack of high resolution observations over a wide FOV. Adaptive optics (AO) systems, which are...

From galaxy formation theory we expect galaxies to be embedded in massive dark matter haloes. For spiral and dwarf galaxies this has indeed been observationally...

The distribution of matter in galaxies of different luminosities and Hubble types, as inferred from observations, plays an important role in cosmology...

Dark Matter in Galaxies is an important subject of current astrophysical research. I will concentrate on spiral galaxies, and first give an overview of the...

By providing information on distances and proper motions for one billion stars, the Gaia satellite allows us to investigate the major unsolved challenges in...

There is an increasing multiplicity of proposed methodologies to derive chemical abundances in HII regions from the measurement of the relative fluxes of their...