NASA news: This incredible Hubble picture was snapped from 135 million light-years away

But if the galaxy shows stronger signs of emissions lines, it is likely still active and spitting out newly born stars.

ESA said: “This technique, known as spectroscopy, can tell us about a galaxy’s type and composition, the density and temperature of any emitting gas, the star formation rate, or how massive the galaxy’s central black hole might be.

“While not all galaxies display strong emission lines, NGC 3749 does.

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