Se hai scelto di non accettare i cookie di profilazione e tracciamento, puoi aderire all’abbonamento "Consentless" a un costo molto accessibile, oppure scegliere un altro abbonamento per accedere ad ANSA.it.

Ti invitiamo a leggere le Condizioni Generali di Servizio, la Cookie Policy e l'Informativa Privacy.

Puoi leggere tutti i titoli di ANSA.it
e 10 contenuti ogni 30 giorni
a €16,99/anno

  • Servizio equivalente a quello accessibile prestando il consenso ai cookie di profilazione pubblicitaria e tracciamento
  • Durata annuale (senza rinnovo automatico)
  • Un pop-up ti avvertirà che hai raggiunto i contenuti consentiti in 30 giorni (potrai continuare a vedere tutti i titoli del sito, ma per aprire altri contenuti dovrai attendere il successivo periodo di 30 giorni)
  • Pubblicità presente ma non profilata o gestibile mediante il pannello delle preferenze
  • Iscrizione alle Newsletter tematiche curate dalle redazioni ANSA.


Per accedere senza limiti a tutti i contenuti di ANSA.it

Scegli il piano di abbonamento più adatto alle tue esigenze.

Traces of first stars in gas clouds

Traces of first stars in gas clouds

Observed in the distant universe

01 luglio 2023, 10:59

Redazione ANSA

ANSACheck

This artist’s impression shows a distant gas cloud that contains different chemical elements, illustrated here with schematic representations of various atoms (Credit: ESO/L. Calçada, M. Kornmesser) - RIPRODUZIONE RISERVATA

This artist’s impression shows a distant gas cloud that contains different chemical elements, illustrated here with schematic representations of various atoms (Credit: ESO/L. Calçada, M. Kornmesser) - RIPRODUZIONE RISERVATA
This artist’s impression shows a distant gas cloud that contains different chemical elements, illustrated here with schematic representations of various atoms (Credit: ESO/L. Calçada, M. Kornmesser) - RIPRODUZIONE RISERVATA

Traces left from the explosion of the first stars in the universe have been seen in clouds of gas dating back to 11 billion years ago, when the universe was still very young. The study, published in The Astrophysical Journal, was conducted by the Paris Observatory, the University of Florence and Italy’s National Astrophysics Institute (INAF), and is based on data from the Very Large Telescope (VLT) of the European Southern Observatory (ESO), in Chile.

“For the first time ever we are able to identify, in very distant clouds of diffused gas, the chemical traces of the explosions of the first stars, those which were formed after the Big Bang", says the lead author of the study, Andrea Saccardi, a doctoral student at the Paris Observatory.

In order to seek the tell-tale sign of the first stars that formed from the primordial gas, the team studied for the first time the chemical composition of diffused gas clouds, iron-poor and distant. It was possible to do so thanks to a very strong light source behind the clouds: quasars, very far-off galaxies that house supermassive black holes in an active phase. The extremely powerful light of the quasars, travelling through the universe, passed through the gas clouds, and it was modified by the different chemical substances present in them. These traces were detected by the X-shooter spectrograph of the ESO’s VLT.

Riproduzione riservata © Copyright ANSA

Da non perdere

Condividi

O utilizza