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Gaia released the most detailed catalogue of stars in the galaxy so far

wallpapers News 2020-11-26
An international team of astronomers has released the most detailed catalogue of stars in the galaxy so far the third data on the position motion brightness color of stars released by the Gaia Space Observatory of the European Space Agency (ESA) as well as the results of the first optical measurement of the acceleration of the solar system Step 1 reveals the evolution of the galaxy. The

"Gaia" were launched in 2013 orbiting around Lagrange 2 (L2) 1.5 million kilometers from the earth. The balance of gravity between the earth the sun is achieved here which can keep the spacecraft stable carry out long-term measurement. The main mission of

"Gaia" is to use parallax method to measure the distance between stars. By scanning the sky continuously the changes of stars' positions with time are measured the distance between them is calculated. The first two data released by

"Gaia" cover the positions of 1.6 billion stars. The results released this time make the total number of stars close to 2 billion the accuracy of the data is far higher than the previous data. In addition Gaia tracks changes in brightness position of stars measures their speed toward or away from the sun estimates their chemical composition.

researchers point out that the latest data include accurate measurements of 300000 stars closest to the sun (within 326 light years) which can be used to predict changes in the background of stars in the next 1.6 million years. In addition they confirmed the orbital acceleration of the solar system's rotation around the Milky Way - in more than a year the sun accelerated to the center of the galaxy at a speed of 7 mm / s while it was travelling at 230 km / s. The data provided by

"Gaia" further deconstruct the two largest companion galaxies in the galaxy the Magellanic nebula the Large Magellanic nebula enabling researchers to see their different star clusters.

Dr. Froude von Levin of the Institute of astronomy Cambridge University UK is the director of the Gaia project in the UK. He commented: "Gaia is measuring the distance of hundreds of millions of objects thouss of light-years away with the accuracy equivalent to measuring the thickness of a hair at a distance of more than 2000 km. These data are one of the pillars of astrophysics enabling us to analyze stellar neighborhoods to solve key questions about the origin future of the Milky way

"Gaia" will continue to collect data until at least 2022 or "postpone retirement" until 2025. At that time the accuracy of star position velocity will be more than 1.9 times 7 times higher than the current data.


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