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SYFY WIRE Bad Astronomy

Astrophoto: The Arch of the Galaxy

By Phil Plait

Just the other day, scifi author (and devoted churro fanatic) John Scalzi tweeted, âI've said it before but it's worth repeating: I love living somewhere I can see the Milky Way.â

I agree (and told him so). Living in an area with only mild light pollutionâlight from buildings, cars, street lights, and so on, leaking upward into the air and illuminating itâmeans when I walk outside into my back yard, I can immediately see lots of stars. Give me 15 minutes to let my eyes adapt to the darkness and itâs quite lovely here in Boulder. I can see the Milky Way as a faint, fuzzy stream across the sky.

But Iâve been to darker sites, places much farther from the lights of civilization, where the Milky Way is even more stunning. Still, the combined might of a hundred billion stars is reduced to a faint glow here on Earth, so the darker the sky, the higher the contrast, and the easier to see our galaxyâs wonder.

This is why Iâm a tad jealous of photographer Mike Shainblum, who traveled into the Anza Borrego desert in southern California, a couple of hundred kilometers east of San Diego. The skies there get pretty dark, and the dry air cuts back on the scattered light from cities. Searching for the perfect road to make his foreground, he took this amazing picture of the galaxy in which we live:

This shot is actually a mosaic of 14 separate pictures, carefully merged into one big image. Itâs a bit distorted; thatâs a consequence of using a wide-angle lens and putting together so many separate shots. But still, itâs gorgeous. The central hub of the galaxy is obvious on the right, splashed with dark dust lanes that absorb the starlight from behind them, reddening it as well in much the same way dust in the air makes a sunset look aflame.

You can trace the dust to the left, following the plane of the Milky Way. Our galaxy is actually shaped like a huge disk, 100,000 light years across and about 1000 light years thick. In proportion, itâs about the same as three DVDs stacked together. We live inside the disk, so we see it edge-on, a thick stream of stars, gas, and dust strewn across the sky.

Light pollution dims this magnificence easily, but can also add some art to the picture; distant cities in Mexico punctuate the horizon in Shainblumâs picture, adding a splash of yellow for contrast.

Shainbloom is a gifted photographer; I featured his time-lapse video âExistenceâ on the blog a few months ago, and his astrophotos are simply spectacular. Itâs well worth your time to peruse them.

Tip oâ the lens cap to Raphael Fraser on Twitter.

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