Category Archives: astronomy

Hittin’ the Charts

Find your View of the Sky

It’s moving on toward autumn sky-viewing time here in the northern hemisphere (and early spring for the folks in the south). If you don’t already have a collection of star charts, or a program like Software Bisque’s TheSky, or a book or two about stargazing, you can always look online for any number of great free (or low-cost) resources to help you figure out what you want to observe. (If you’re interested in finding astronomy products, check out TheSpacewriter’s Store.)

A screenshot of the Sky View Cafe

So, browsing around online, I found a great astronomy resource today while I was trying to figure out what the skies would be like over the Caribbean later next year (for a lecture I need to give).  This one’s an interactive planetarium page called Sky View Café. You can use it with your Java-enabled web browser to find out what’s up tonight at your location. You can also download a desktop version for offline use. It’s the work of an imaginative coder named Kerry Shetline. Here’s a screenshot of the online interface, and it couldn’t be easier to use. Simply input your location and the date and time you want to observe, and it automatically takes the sky to the proper position. There’s an extensive and easy-to-understand help section, too.  Go take a browse through the starry sky before your next stargazing session!

Ice Clouds on Mars

Brought to you by the Phoenix Lander

Well, this is cool! It looks like a procession of thin cirrus clouds here on Earth, but they’re actually floating above the Mars surface. The clip was made from a succession of ten images taken by the Surface Stereo Imager on the Phoenix Mars Lander, taken on August 29, 2008.

As in Earth’s atmosphere, these clouds are made up of water-ice particles.  According to the folks on the lander team, these clouds give us a good look at the Martian water cycle. Here’s how it works: water vapor comes off the north pole during the peak of summer. The peak period of water-vapor abundance at the Phoenix site has just passed and there’s plenty of vapor available to form into clouds, fog and frost, which explains what the lander has been seeing. It will be interesting to watch clouds over the next few months as northern hemisphere autumn approaches.