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Perseus-Taurus Shell
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<p>The Perseus-Taurus Shell (also shortened to the Per-Tau shell) is a near-spherical cavity in the interstellar medium, 500 <a href="/facts/Light-year/IGc5NdQb">light-years</a> wide, located in the Perseus-Taurus constellations. A team from the <a href="/facts/Harvard%25E2%2580%2593Smithsonian_Center_for_Astrophysics/1MNDcvoo">Harvard Smithsonian Center for Astrophysics</a> led by Catherine Zucker and Shmuel Bialy discovered the structure in 2021. Scientists believe that it appeared following the explosions of ancient <a href="/facts/Supernova/Pfo2J23l">supernovae</a>. <a href="/facts/Molecular_cloud/5jEwCJxs">Molecular clouds</a> surround the sphere-shape cavity. </p>