Space: A new, unprecedented map of the Milky Way

Views of the Milky Way galaxy and surrounding galaxies measuring 1.7 billion stars from the Gaia satellite, and provided by the European Space Agency on April 25, 2018. (European Space Agency / AFP / -)

Gaia mission with space telescope Draws a detailed map of the Milky WayOn Monday, June 13, a new version of the nearly two billion star-studded data was unveiled, following its trajectory and analyzing features.

“It’s a Swiss Army knife of astrophysics. There is no single astronomer who will not use their data directly or indirectly.AFP Franোয়াois Mignard, an astronomer at the C ডিte d’Azur Observatory, is responsible for Guy for France.

One and a half crore miles from the earth

The community of astronomers could draw on the third catalog of data collected by the instrument from Monday. A crop, with about fifty scientific articles, which lists many celestial objects.

Closest, with More than 150,000 asteroids Our solar system, “whose instrument has calculated orbits with unparalleled accuracy,” says Franোয়াois Mignard, is going through new measurements.1.8 billion stars in the Milky Way. And outside of this galaxy: the population of other galaxies and distant quasars.

Launched by the European Space Agency (ESA) in 2013, the Gaia Telescope is located at a convenient location called L2, 1.5 million kilometers from the Earth, opposite the Sun.

Artistic image of the Gaia Telescope posted on the European Space Agency (ESA) website on September 13, 2016.
Artistic image of the Gaia Telescope posted on the European Space Agency (ESA) website on September 13, 2016. (© ESA / AFP / Archives / STR)

Scan the sky

“Gaia scans the sky and collects what it sees,” says astronomer Misha Hewed at the Paris-PSL Observatory. It detects and observes a very small fraction (only 1%) of the stars in our galaxy, measuring 100,000 light-years in diameter.

But he set up much more than a simple map. Its two telescopes are connected to a billion-pixel photographic sensor, where the number of commercial cameras is in the millions. Three astrometry instruments, photometry and spectroscopy, thus recovering photons, will interpret real light signals.

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It provides thanks for a worldwide observation of the positions of what is going on in the sky. This is the first time. Before Gaia, “We had a really limited view of the galaxy.

Misha HowdAstronomer at the Paris-PSL Observatory

Before Guy? It was Hypercos, a satellite that revolutionized observation since its launch by the ESA in 1997, listing more than 110,000 space objects.

With Gaia, astronomers can access not only the position and motion of a large number of stars, but also measure their physical and chemical character and, just as importantly, their age.

Paula de Matte, a fellow astronomer with Misha Haywood at the Paris-PSL Observatory, also explained so much information “that informs us about the evolution of their past and therefore the galaxy.”

The main discovery

Astronomers continue to say “this is one of the reasons why Gaia was created.”

Stars have the distinction of surviving for billions of years. Their measurements are therefore like a fossil that tells us about the state of the galaxy during their formation.

Misha HowdAstronomer at the Paris-PSL Observatory

This overview of the Milky Way’s star movements has already led to major discoveries. With the help of the second catalog given in 2018, astronomers were able to show that our galaxy was “united” ten billion years ago.

The catalog has produced thousands of scientific articles since its first edition in 2016. The flood of information required a dedicated ground processing chain, DPAC, called for supercomputers from six European computing centers, and an association of 450 experts, explained François Mignard, who was in charge.

“There is no mission without this processing group”, as Gaia produces 700 million star positions, 150 million light-measurements and 14 million spectra per day. Raw data is a torrent that converts “human-driven” algorithms into measurements that can be used by astronomers.

It will take five years to provide this third catalog of observations spread from 2014 to 2017. And it will have to wait until 2030 to get the final version, when Gaia will finish space scanning in 2025.

Source: © 2022 AFP

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