Amina Helmi, a galactic archaeologist, is uncovering the Milky Way’s tumultuous history by studying what she calls ‘cosmic fossils.’ These are remnants of ancient stars that provide insights into the galaxy’s violent formation, shaped by massive collisions over billions of years. Helmi’s work reveals that the Milky Way was not formed through a gradual process but rather through a series of dramatic galactic mergers, notably with a dwarf galaxy known as Gaia-Enceladus.
The European Space Agency’s Gaia mission has been pivotal for Helmi’s research, allowing her to analyse vast amounts of data on star movements. This data has transformed our understanding of the Milky Way’s structure, showing that its current form is a result of past cosmic events rather than a smooth evolution. Helmi’s findings challenge long-held beliefs about galaxy formation and highlight the chaotic nature of cosmic history.
Recently awarded the Kavli Prize, Helmi’s recognition underscores the growing importance of galactic archaeology in astrophysics. Her work not only sheds light on the past but also hints at the future of our galaxy, suggesting that while it has experienced a wild youth, it now enjoys a period of relative calm. This perspective is crucial as it informs our understanding of galactic evolution and the potential for future cosmic events.
As Helmi continues her research, she looks forward to analysing more data from the Gaia mission, which could further unravel the mysteries of the Milky Way. The implications of her work extend beyond astronomy, influencing how we perceive our place in the universe and the dynamic processes that shape it.
Source: France 24
