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SOAR Telescope Unveils Eta Carinae's Spectral Secrets

10/6/2025

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Summary

Story summary

The STELES spectrograph on the SOAR Telescope captures high-resolution spectral lines of Eta Carinae, revealing subtle shifts.
Eta Carinae is a binary about 7,500 light-years away in the Carina Nebula; the primary is ~90 solar masses, the companion ~30.
In the mid-1800s it underwent the Great Eruption, briefly becoming the second-brightest star, with the Homunculus Nebula glowing from stellar interactions.

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Story summary

The STELES spectrograph on the SOAR Telescope captures high-resolution spectral lines of Eta Carinae, revealing subtle shifts.
Eta Carinae is a binary about 7,500 light-years away in the Carina Nebula; the primary is ~90 solar masses, the companion ~30.
In the mid-1800s it underwent the Great Eruption, briefly becoming the second-brightest star, with the Homunculus Nebula glowing from stellar interactions.