Night Sky Guide: View above Spain
Astrophotographer Fins Eirexas: "The Gegenschein or 'counterglow' imaged above the dolmen of A Gándara de Baiñas, from A Fervenza reservoir. A rare occasion to see two elusive targets: the fuzzy Gegenschein struggling with light pollution and this megalithic monument, emerged from the water due to the current draught. A very misty evening made both targets even more difficult."
A dolmen, or portal tomb, is a type of single-chamber megalithic tomb, usually consisting of two or more upright megaliths supporting a large flat horizontal capstone or "table". Most date from the Late Neolithic period (4000–3000 BCE) and were sometimes covered with earth or smaller stones to form a tumulus (burial mound).
If you look carefully enough, you can even see the glow of the Sun. At night this glow is known as the gegenschein (German for “counter glow”), and can be seen as a faint glow in an extremely dark sky. The gegenschein is sunlight back-scattered off small interplanetary dust particles. These dust particles are millimeter sized splinters from asteroids and orbit in the ecliptic plane of the planets.
Date: Oct. 15, 2026
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