Thor’s Helmet: A Hot Star by Any Other Name

Thor's Helmet, courtesy NOAO.edu

Astronomers love to give evocative names to the objects they observe. That’s why we hear about things like the Ring Nebula and the Cat’s-Eye Nebula. Sure, the things they describe look like the name, although the monickers don’t always have much to do with the intrinsic nature of the object.

I recently ran across a really exciting-looking image of a bubble of gas being blown out by a Wolf-Rayet star. WRs are extremely hot (25,000-50,000 K), energetic stars that blast their outer layers away at thousands and thousands of miles per second. incredibly hot (25,000-50,000K) and expel their outer layers of gas at tremendous velocities (thousands of kilometers per second). It’s about 15,000 light-years away in the direction of the constellation Canis Major (the Big Dog). But, because it’s so bright and energetic, we can see it very nicely.

A Time Away

I spent last week at a planetarium conference in Denver. We had a wonderful time visiting with clients from around the western U.S. and seeing the latest and greatest in planetarium, fulldome technology.

The planetarium is one of those places in the public mind that’s associated with museum visits or school visits or, to our great dismay sometimes, only thought of as that place they spoofed in “South Park.” But, it ain’t your father’s planetarium any more. The domed theaters we all grew up in, learning about the stars and planets and galaxies, are changing as technology changes. Sure, they still project stars. Some do it with the old opto-mechanical “ant in the middle of the room” equipment, usually supplemented by special slide projectors to help create immersive environments like the surface of a planet or the vision of an undersea environment on another planet. Others do it with video projection systems, and we saw a lot of those kinds of system at the meeting last week.

I write planetarium shows and of course my husband produces them. Video production is right up our alley, and lets us show my scripts and his music and the visuals of the cosmos to great advantage. And of course we’re immersed in video production now. It’s a great feeling to know that the stories I tell about astronomy can be visualized the way I see them in my mind’s eye.

But, you ask, what about the old style of shows? The constellation identifications? The great lectures showing the latest images from HST or Spitzer or other observatories? The good news is — they’re still possible! Nothing has changed there. Well… the technology has. And the skill sets to make presentations under the dome are new ones for many planetarians. But they’ll cope and grow and embrace them. If any of the talks I heard last week are any indication, the planetarium world’s evolution will be scary, exciting, and maybe even fun! (Once we learn those skills!)