Articles tagged with "paranal"
It’s very dark at Paranal but there’s still background light that we can’t do anything about: the atmosphere itself glows at night. It can be surprisingly bright. Often it’s green, when oxygen atoms are glowing. It can be red, too, when nitrogen is responsible. And it can be orange, when sodium atoms are being excited. Tonight, it was extremely orange, looking a lot like streetlights on clouds, except there were no clouds, and there are definitely no streetlights near here. It got really strong while I was taking a time lapse and you can see huge waves in the upper atmosphere rippling.
Paranal is very dark, but there are some sources of light pollution we can’t do anything about. 80 miles north is the city of Antofagasta, which showed up more clearly than usual in this photo because of low cloud reflecting the street lights. And a similar distance up is the upper atmosphere, which glows faintly at night. Further afield, dust particles in the solar system reflect sunlight and cause the faint white band that stretches up from the horizon. The handle of the Plough is visible just above Antofagasta – a far northern constellation that we can just about see from down here.
The Magellanic Clouds are satellite galaxies of the Milky Way. Mapuche mythology says that today there is a large one and a small one, but there used to be three large ones. One disappeared, one is on the way out, and the third one is still complete for now, but when it too runs out, the universe will end.
Spotting Hubble going over is always nice. It’s not so easy to see – you can’t miss the International Space Station when it goes over, but Hubble is much smaller and fainter. It also orbits a bit lower so it’s often crossing the sky in twilight. Tonight, though, it was already quite dark when I caught it going over UT3