(Credit: ESA/Gaia/DPAC) When you’re walking through a forest, it’s nearly impossible to know the forest’s boundaries or layout. This reflected the optical technique of interferometry that was originally planned for use … This same idea applies with our galaxy, yet we know the Milky Way is a spiral galaxy, and we know our Sun orbits the center of the galaxy from about 26,000 light-years out. Gaia spies, with its gigapixel eye, something beginning with “P”. Brunier The event may appear straightforward, but it marks the culmination of years of careful mission analysis work supported by orbital calculations. Mapping one billion stars in our Galaxy may seem like an impossible feat, but that’s exactly what ESA’s Gaia mission aims to do, with the ultimate goal of creating the largest, most precise 3D map of our Galaxy ever made. Galaxies, open and globular clusters in Gaia's sky map “With Hipparcos, we could only analyse the 3D structure and dynamics of stars in the Hyades, the nearest open cluster to the Sun, and measure distances for about 80 clusters up to 1600 light-years from us,” says Antonella Vallenari from the Istituto Nazionale di Astrofisica (INAF) and the Astronomical Observatory of Padua, Italy. It is a fully European mission. Gaia is an ESA mission to survey more than one billion stars in our Galaxy and its local neighbourhood in order to build the most precise 3D map of the Milky Way and answer questions about its structure, origin and evolution. The mapping begins. The Gaia mission was approved in 2000 as an ESA Cornerstone mission. Gaia, operated by the European Space Agency (ESA), surveys the sky from orbit to create the largest, most precise three-dimensional map of our galaxy. At this point Gaia was working so well that it was producing more data than originally foreseen, since it was able to see stars fainter than required.
Along … By July 2014, Gaia was busy mapping parts of the sky that had been calibrated by ground telescopes, before its nominal scanning mode was entered in September. Gaia mapping the stars of the Milky Way. Gaia is a space observatory of the European Space Agency (ESA), launched in 2013 and expected to operate until c. 2022.

ESA / Science & Exploration / Space Science / Gaia The mass of a very young exoplanet has been revealed for the first time using data from ESA’s star mapping spacecraft Gaia and its predecessor, the quarter-century retired Hipparcos satellite. Further reading here. The close encounter likely took place sometime in the past 300–900 million years. ESA’s star mapping mission, Gaia, has shown our Milky Way galaxy is still enduring the effects of a near collision that set millions of stars moving like ripples on a pond. ESA’s Gaia: mapping the Milky Way ... For the last five years, the European Space Agency’s Gaia spacecraft has been creating the most detailed map of the Milky Way ever made. Credit: ESA/ATG medialab; background: ESO/S. The European Space Agency (ESA) has taken a "galactic census" of the Milky Way, unveiling the second major data release from the Gaia mission. ESA’s star mapping mission, Gaia, has shown our Milky Way galaxy is still enduring the effects of a near collision that set millions of stars moving like ripples on a pond. Global Gaia campaign reveals secrets of stellar pair: A 500-day global observation campaign spearheaded more than three years ago by ESA’s galaxy-mapping powerhouse Gaia has provided unprecedented insights into the binary system of stars that caused an unusual brightening of an even more distant star. The spacecraft is designed for astrometry: measuring the positions, distances and motions of stars with unprecedented precision. Gaia launched on 19 December 2013 and now flies 1.5 million kilometres behind Earth as it orbits the Sun. And now you can follow the mission’s progress with a new app created by the University of Barcelona.


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