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Two sunlit spheres can be seen in today's Picture of the Week. While these orbs share similarities in their shape and in being illuminated by the same star, they are vastly different. The one farthest away from the camera, hiding behind the clouds, is our own Moon, the Earth's only natural satellite. The other object is the dome of a telescope at ESO's La Silla Observatory, located in the outskirts of the Atacama Desert, in northern Chile.
The telescope is one of the three in the French project Exoplanets in Transits and their Atmospheres (ExTrA). ExTrA is focused on detecting Earth-sized worlds in the Milky Way. It relies on the transit method, where planets block a fraction of the light from the star they orbit when passing between it and Earth, just like a partial eclipse. ExTrA centres on worlds orbiting red dwarfs –– stars much smaller, colder and dimmer than the Sun. Because red dwarfs are small, planets crossing in front of them block more light, making them easier to find than planets orbiting regular stars.
Who knows, perhaps some of these planets may look as otherworldly as the landscape of this picture. “These places compel me every time to think about our position in the Universe, putting my life ‘in context’ so to say,” says the photographer, ESO astronomer Luca Sbordone. “It always brings me peace.”