IXPE

Rarity: Common

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What Wikipedia says

Imaging X-ray Polarimetry Explorer, commonly known as IXPE or SMEX-14, is a space observatory with three identical telescopes designed to measure the polarization of cosmic X-rays of black holes, neutron stars, and pulsars.

Excerpt from the Wikipedia article “IXPE”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA/MSFC, Public domain, via Wikimedia Commons.