Triangle

Image without labels

Camera: Canon EOS 300D Digital Rebel
Lens: Sigma APO 70-300mm @ 100mm, f/4.5
Exposure: 10x6s=1min @ ISO1600
Mount: Tripod
Processing: Dark, flat and bias calibration, alignment, stacking and digital development in IP 2.0.
Levels, curves, skyglow and noise removal in Photoshop CS with Neat Image.