Sunday Matinee – Aurora Borealis and North America at Night

[Video Credit: Image Science & Analysis Laboratory, NASA Johnson Space Center]

This video was taken by the crew of Expedition 29 on board the International Space Station. The sequence of shots was taken October 18, 2011 from 07:09:06 to 07:27:42 GMT[.]

This video compacts about 18-and-a-half minutes of ISS travel into about 30 seconds.

What I particularly enjoy about this video is that it starts looking directly to the area of the planet I occupy. Alaska’s Kenai Peninsula is easily distinguishable, especially due to the city lights of Kenai, Soldotna, Homer, and Seward. South of that you can see Kodiak Island. Immediately north of the Kenai Peninsula, Anchorage is brightly lit; Fairbanks can be seen even further to the north. The video travels east across the United States, as you find yourself struggling to decide on whether you should watch the aurora borealis (northern lights) to the north, or try to guess all of the cities you can see due to the concentrated man-made light. Clouds obscure much of the view between Alaska and the Rockies, but they break in time to offer great Canadian views of Calgary and Edmonton.

Following that, Minneapolis/St.Paul stand out, just before Chicago takes center-stage at around 24 seconds in, brilliantly lit, just south of Lake Michigan. You can catch the flashes of a lightning storm as we continue east towards the East Coast of the United States. You might notice how populated and electrified the East Coast is, compared to the Mid-West and the central United States. The video ends just after our view heads east over the coast of Florida, and above the shallow waters of the Bahamas.

Ursa Major

The following video is my first real attempt at time-lapse astrophotography. I chose one of my favorite constellations, Ursa Major (best known for containing The Big Dipper). The video shows the motion of the constellation over a 45-minute period.

I live in a small city, so some light pollution factored into the result but overall the night was quite clear. You can clearly make out “The Horse and Rider”, two stars that make up what is typically seen as the second star in The Big Dipper’s handle. The ability to see these two stars, Mizar and Alcor, was used by the Arabs, Romans, and English to test the eye-sight of their warriors.

But there’s even more to Mizar and Alcor than meets the (unaided) eye. Mizar is actually a quadruple system of two binary stars and Alcor is a binary system. Together, they make up sextuple system, as they are all apparently gravitationally bound.

To put it simply, Mizar — which we see as the brighter star, the horse, making up the Horse and Rider — is two sets of two stars orbiting each other. Alcor, is a single set of two stars orbiting each other, and is in turn interacting with the Mizar system. Six stars, dancing together in a cosmic folk dance, appearing to us on Earth as one or two stars (depending on your eyesight).

Additionally, this all goes to show that as much as we think we know about the cosmos, there is so much more out there to discover. Mizar and Alcor have been two of the most observed objects in the night sky for millennia, yet we still continue to unravel more of their magic.

Ursa Major

Ursa Major