воскресенье, 10 ноября 2019 г.

5000 "eyes" to follow the expanding universe







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November 2, 2019

Involving researchers from EPFL, a project to unravel the nature of dark energy is entering its final phase of testing.


Image above: The Dark Energy Spectroscopic Instrument (DESI) is a project led by the United States to measure the accelerated expansion of the Universe to discover the nature of dark energy. This project, to which EPFL astrophysicists have contributed significantly, is entering its last phase of testing to map the sky.

The Dark Energy Spectroscopic Instrument (DESI) is a project led by the United States to discover the nature of dark energy. This project, to which EPFL astrophysicists have contributed, is entering its last phase of testing. The first results are expected in 2021.

Dozens of millions of galaxies

The DESI was developed to examine the nature of dark energy by measuring in detail the accelerated expansion of the Universe, said Wednesday the Swiss Federal Institute of Technology Lausanne (EPFL) in a statement. Dark energy is a mysterious element that constitutes about 68% of the mass-energy of the current Universe.

DESI has announced its "first light", entering its final testing and commissioning phase on the Mayall telescope at the Kitt Peak Observatory. This means that the instrument will be ready to begin its scientific observations in early 2020. The first major publication of data is expected by 2021.

Over the next four years, optical spectra of tens of millions of galaxies and quasars will be collected to create a 3D map covering the Near Universe up to 11 billion light-years.

To do this, DESI will use 5000 "eyes" of optical fiber to capture the light of 5000 different objects, mainly galaxies, but also quasars and some stars that will be used mainly to calibrate the instrument.

Distance to the Earth

DESI is designed to automatically point a predetermined series of galaxies, collect their light, and then, thanks to ten spectrographs, separate this light into narrow color bands to represent on a map their distance from the Earth. Scientists will be able to calculate the expansion of the Universe according to the light of the galaxies that has reached our planet.

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