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IT’S NOT JUST IN YOUR MIND!

This star exploded about 43,000 years ago

It’s easy to get lost following the intricate filaments in this detailed mosaic image of faint supernova remnant Simeis 147 (S147). Also cataloged as Sh2-240, it covers nearly 3 degrees or 6 full moons on the sky.
That’s about 150 light-years at the stellar debris cloud’s estimated distance of 3,000 light-years. … This sharp composite includes image data taken through a narrow-band filter to highlight emission from hydrogen atoms tracing the shocked, glowing gas.
The supernova remnant has an estimated age of about 40,000 years, meaning light from the massive stellar explosion first reached Earth 40,000 years ago.

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