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TESS Dates an Ancient Collision with Our Galaxy

19 Jan 2020, 13:08 UTC
TESS Dates an Ancient Collision with Our Galaxy
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A single bright star in the constellation of Indus, visible from the southern hemisphere, has revealed new insights on an ancient collision that our galaxy the Milky Way underwent with another smaller galaxy called Gaia-Enceladus early in its history.An international team of scientists led by the University of Birmingham adopted the novel approach of applying the forensic characterization of a single ancient, bright star called ν Indi as a probe of the history of the Milky Way. Stars carry “fossilized records” of their histories and hence the environments in which they formed. The team used data from satellites and ground-based telescopes to unlock this information from ν Indi. Their results are published in the journal Nature Astronomy.The star was aged using its natural oscillations (asteroseismology), detected in data collected by NASA's recently launched Transiting Exoplanet Survey Satellite (TESS). Launched in 2018, TESS is surveying stars across most of the sky to search for planets orbiting the stars and to study the stars themselves. When combined with data from the European Space Agency (ESA) Gaia Mission, the detective story revealed that this ancient star was born early in the life of the Milky Way, but the Gaia-Enceladus collision altered its motion ...

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