Supernova from the Universe’s Childhood
A massive galaxy cluster acts as a giant lens. Its gravity warps the fabric of space, and the light of distant objects, bending around this curvature, is amplified and split into multiple images.
A Distant Galaxy Cluster That Wasn't So Quiet After All
A city at night looks quiet from above, but life bustles in its neighborhoods: streets are blocked off, construction is underway, and equipment hums in basements. That's roughly how astronomers now see the galaxy cluster SPT-CL J2215-3537, located so far away that its light has traveled for more than 8 billion years.