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This artist’s conception illustrates one of the most primitive supermassive black holes known (central black dot) at the core of a young, star-rich galaxy. Astronomers using NASA’s Spitzer Space Telescope have uncovered two of these early objects, dating back to about 13 billion years ago. The monstrous black holes are among the most distant known, and appear to be in the very earliest stages of formation, earlier than any observed so far. Credit: NASA/JPL-Caltech.

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Credit: Tim Doucette.

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This 2016 Curiosity rover selfie shows the vehicle at the “Okoruso” drilling site on Mount Sharp’s Naukluft Plateau. The Martian scene is a mosaic of images taken with the arm-mounted Mars Hands Lens Imager (MAHLI). Credit: NASA/JPL-Caltech/MSSS. Credit: NASA/JPL-Caltech/MSSS.

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Standing stone

Sérgio Conceição from Elvas, Portugal

The Milky Way arches above the Menhir of Meada, thought to be the largest example on the Iberian Peninsula of a menhir — stones placed upright by Bronze Age (or possibly earlier) peoples for reasons unknown. The imager used a Canon mirrorless camera and 15mm lens to take two minutes of exposure at f/2.8 and ISO 640.