Linda Connor
contact prints on printing-out paper from vintage glass plate negatives of Solar Eclipse from the collection of The Lick Observatory
1893-1910, prints made 1977-1996
Light Poles can be seen at nights over large cities with different colored lights. They can only be seen during very cold weather (the temperature of -20 Celsius degrees or lower is required), with minimal wind and plenty of tiny ice crystals in the atmosphere.
blua:
What the city is missing: Thierry Cohen photographs cityscapes and then photographs deserts at night, combing the two to show us what our cities would look like with the lights off. The stars are not enhanced, they are actual photos from relative latitudes that would expose the same starry sky view if it weren’t for light pollution. Click on each photo to see which city it is.
Light pollution and pollution in general
Jupiter’s moon Io, photographed by Voyager 2, 10 July 1979.
The end of this blog’s Io-thon follows on from yesterday’s post. The photos used in this gif were taken with longer exposures than yesterday’s, so there is a better contrast between Io and the background. Two volcanic eruptions are clearly visible in the top-left: I think that they are from Amirani and Maui. There’s also an eruption on the right-hand side, but as its only lit by reflected light from Jupiter, it requires a lot of brightening to see (NASA’s photojournal shows it here).
You can also see a volcano in the south, tall enough to stay in sunlight even as the surrounding areas fall into darkness.
Yesterday I mentioned the bright spot glinting near the equator. I asked Jason Perry (who used to write an Io blog) about it on Twitter and he said that it “looks like specular reflection off of glassy, cooled lava near Hi’iaka Patera.” So there you go.
