The results suggest that these stars have formed in-situ, rather than having been accreted from smaller galaxies, shedding light on the build-up history of our Galaxy.Īnatomy of the Milky Way. These `ghost rider’ stars probably came from a smaller galaxy that was cannibalized by the Milky Way.Īnother group, led by Ana Bonaca, combined the data with spectroscopic surveys obtained from the ground to investigate an intriguing population of stars in the halo of the Milky Way. An immediate surprise was the discovery of a large population of stars that orbit the Milky Way in the opposite direction to most stars. The investigation of this structure was one of the prime motivations for building Gaia in the first place.
Its structure reveals the formation processes of the Galaxy. The halo is the cloud of stars that surrounds the main disc of the Milky Way.
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This allows preditcions of what the Galaxy looked like in the past, and what it will look like in the future.Īmina Helmi and colleagues published a study titled “A box full of chocolates” in which they began to reveal the rich structure of the Galaxy’s stellar halo. With such data, astronomers can project the stars’ orbits forwards and backwards in time. Martin Altmann and colleagues derived the movements through space of 583 million stars by comparing the Gaia positions with those of the PPMXL catalogue, a data-set compiled in 2010 from ground-based observations listing positions, proper motions and photometric information of 900 million stars and galaxies. Inspired by this approach, other astronomers performed other combinations. Without the extra data taken over two decades earlier it would not have been possible to disentangle the effect of parallax and proper motion from the Gaia data available at the time, which covered just over a year. This has had a rejuvenating effect on the use of those earlier catalogues as the differences between the star positions and other parameters can be used to see how the stars have moved or even evolved in the interim.Ĭombining the first batch of Gaia data with that from ESA's earlier Hipparcos mission is what allowed the estimate of proper motions (the motion of objects across the plane of the sky) and parallaxes (a measure of the distance) for the two million stars. To do this, comparisons with the results from previous astrometric catalogues have also been performed.Īrtist's impression of Hipparcos. The principal check involved verifying that the stellar parameters derived from Gaia data are scientifically robust and that all effects related to the satellite and instruments are correctly taken into account. Gaia has already fundamentally contributed to astronomy," says Timo Prusti, Gaia Project Scientist. "There are more than 300 refereed papers from the first data release. It demonstrated the high quality of the scientific data derived from the raw satellite observations by allowing astronomers to publish many new scientific results. The 2016 release was a 'test package' designed to allow astronomers to verify that the observing strategy and the data processing 'pipeline' are working well. Gaia's mission is to create the most accurate map of the Galaxy to date. It included the position and brightness for 1.1 billion stars, and distances and motions for two million of those stars. Credit: ESA/Gaia/DPAC.īased on 14 months of observations, the initial release was published on 14 September 2016. Her motto in life: Live Your WHOLE Story.Gaia's first sky map. She loves eating gourmet cupcakes, running half-marathons, travelling the world, and finding the peace of stillness.
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During her free time, Keri loves spending time with her 12-year old twin boys who are her greatest teachers in life. She brings a diverse background of business expertise, communication skills, and years of personal development to her coaching practice. Keri has been involved extensively with the clinical and corporate healthcare business for over 19 years because of her love of people. Her mission is to help women leaders finally say YES to themselves moving from optional to non-negotiable in their own lives knowing clearly who they are, what they want, and where they are going. She enjoys the diversity of a worldwide client base fostering a holistic approach to life and leading with direction. Keri spends her life looking for the a-ha moments to share with her clients. Keri Stanley is a Coach, Speaker, and Heart-centric Entrepreneur.
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