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Description: |
In present-day astronomy,
the main processes occurring in stars are known in remarkable detail, and on
the largest scales it is claimed that we are in an era of `precision
cosmology', with the principal numbers that describe the content and the
expansion of the Universe being known to within a few per cent. However,
the nature of galaxies, the systems of millions or billions of stars that
comprise the building-blocks of the large-scale Universe, remains mysterious
on many levels, in terms of their formation processes, what comprises the
dominant material inside them, and indeed why they exist at all. This talk
will focus on both the recent advances and the remaining uncertainties in
our understanding of galaxies. |