Abstract: Recent great steps taken in the fields of cosmology and astrophysics have lead, inevitably, to new and more detailed sets of questions. X-rays hold the clue to some of the answers by providing diagnostics of the hot inter-stellar gases and plasmas where temperatures reach MegaKelvin (or keV). Superconductors enter the picture by making it possible to satisfy the desire for large, high quality data. In the last few years, detectors based on superconducting technology, have reached maturity and are finding applications in various areas of astrophysics ranging from X-ray spectroscopy to Dark Matter detection. In addition, new concepts based on other low temperature phenomena are being developed and targeted at future experiments. This talk will describe how astrophysics' desire for higher count rates, energy, timing, and position resolution can be satisfied with detectors operating at mK temperatures.