Keywords
1, ahrgebirge, architecture, astronomy, astrophysics, botany, boundary, central europe, cloud, color, concept, contrast, country road, day, deciduous forest, effelsberg radio telescope, eifel, europe, fence, forest, geography, germany, grass, landscape, max planck institute for radio astronom, meadow, mountain, mountain range, natural science, nobody, north rhine-westphalia, number, outdoor, photograph, plant, progress, radio telescope, rhineland, road, science, shadow, sky, street, technology, traffic, transport, vertical, western europe, western germany, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, 2932998