Oxford astronomers are tracking how black holes shred and devour stars, how newborn galaxies take shape, and how invisible dark matter holds the Milky Way together. This research addresses fundamental gaps in our understanding of the universe—how planets form around other stars, how black holes grow by swallowing gas and debris, how galaxies evolve over cosmic time, and what the cosmic microwave background reveals about the earliest moments after the Big Bang. The Oxford team also builds instruments, such as the C-BASS telescope, to strip away foreground noise from our own Galaxy and extract cleaner data from the early universe. This is curiosity-driven fundamental science. It has no immediate practical application. But similar work in the past—such as studies of the cosmic microwave background—led to technologies like sensitive detectors now used in medical imaging and satellite navigation. A deeper grasp of how galaxies, black holes, and planetary systems work could, over decades, feed into new computational methods, precision instrumentation, or unexpected spin-offs in fields from communications to climate monitoring.
View original technical description
Astrophysical research at Oxford University is carried out by investigators with universal interests, spanning scales from planetary to cosmic. We are actively engaged with many of the most exciting questions of modern physics. On the scale of planetary phenomena, we seek to find new worlds and to understand how their atmospheres behave under extreme conditions. With knowledge of a planet's atmosphere, we may be able to learn something of its composition, and how it has evolved. Planetary researchers are interested in how other solar systems form and change with time, and why they seem to be so different from our own. The study of black holes is one of the most exciting areas of astrophysics. We investigate the turbulent gas processes by which black holes grow as they accrete surrounding material, and calculate what one might observe when massive black holes in the centres of galaxies rip apart stars by tidal forces and devour the debris. Gas accretion can produce spectacular fireworks in a quasar or active galaxy, or barely a blip in the case of our own Milky Way Galaxy. Oxford researchers measure the radiation from molecules in distant galaxies to reveal the properties of the central black holes and their surroundings. We pursue studies at the cutting edge of black hole formation, tracking the radio waves emerging from the debris of neutron stars that have collided and coalesced into a black hole, and using this to understand the physics of this remarkable cosmic catastrophe. On scales associated with our own Milky Way Galaxy, we study the motion of individual stars in great detail, using the results to understand how our Galaxy formed and maintains its structure, and how a great halo of invisible dark matter, which keeps the Galaxy bound, betrays its presence through the motions of the stars. We exploit observations of the galactic cluster environment, vast volumes filled with rarified magnetised gas heated to X-ray temperatures, to constrain the fundamental properties of matter suggested by string theory. The evolution of galaxies throughout the Universe is influenced by their environment, which is in turn impacted by galactic feedback. To unravel the details of this galactic coupling through cosmic time is an enormous task. It requires the analysis of vast amounts of observational data. We maintain a large, active group of researchers pursuing this grand problem in all of its scope, from the highest redshifts at which galaxies form up to present cosmic times. Questions pertaining to the rate of star formation throughout cosmic time, to how galactic morphology may itself evolve, to whether the presence of neighbours causes galaxies' spin rotations to align, to how central black holes develop, are all being investigated at Oxford. This involves the use of current facilities as well as planning the design and implementation of key instruments to be associated with major international collaborations. The largest scales of all are associated with the CMB, the cosmic microwave background. The exquisitely difficult but essential process of excising the foreground contamination caused by our own Galaxy is led by the Oxford team designing and building the C-BASS instrument. This is an example of how our researchers are developing techniques to coax profound secrets of the Universe from very sensitive data. What were the initial tiny fluctuations that gave rise to galaxies and their larger scale clusters? What constraints can be placed on the masses of elementary particles and deviations from classical general relativity? By combining information from CMB instruments like Planck with other data sets related to galaxy clustering, powerful new tools are being developed.
Plain English summaries and category classifications on this site are generated by AI and may not perfectly reflect the original research.
Is something wrong? Let us know