A Beautiful Image with a Nice Ring To It

Here is a dramatic image of a dying star, courtesy of amateur astronomer and master photographer Robert Gendler. Called the "Ring Nebula," this cloud of of expelled material surrounds a star somewhat like our Sun, but further along in its life cycle.

Usually, regular telescopes only show the inner glowing part that you see in bluish green in the center. But Dr. Gendler has combined the visible-light image with fainter, cooler infra-red information to show how the star has expelled material not just once, but many times. You can see shell after shell surrounding the star. Like a dying man in those old Victorian novels, who coughs and coughs for months before death releases him, this star has been "coughing up" its outermost layers, as it adjusts to the final internal collapse. After the expanding shells have moved away, what will be left is a dense, hot "star corpse" astronomers call a white dwarf.

The image pixels come from the Hubble, Subaru, and Large Binocular Telescopes. By all means click on the picture and look at the larger version.

The Ring Nebula (a favorite astronomical object for newlyweds) is about 2000 lightyears away in the constellation of Lyra. It is perhaps the best known example of a "planetary nebula." (The name comes from their fuzzy appearance in early telescope; the expanding shell of gas has NOTHING to do with planets.) Astronomers also call it M57 (the 57th entry in Charles Messier's catalog of fuzzy objects in the sky.) If you search for M57 on the web you can learn a lot more about it; or just enjoy the weirdly wonderful picture.

Robert Gendler's other astronomy images can be found at: http://www.robgendlerastropics.com/  

To see a larger version of the amazing Hubble Space Telescope image of this object (which is at the center of our picture), go to: http://hubblesite.org/newscenter/archive/releases/2013/13/image/b/format/large_web/ 

Stunning Wide-Field Image of a Star Nursery

Every once in a while, I see a new astronomical picture that leaves me with my mouth open, saying "Wow!" The above image, assembled by a talented amateur astronomer, from information taken by a number of different telescopes, is one of those.

This wide-angle view is centered on a cluster of recently-born stars that is known by its catalog number of NGC 2264. Surrounding the adolescent stars is a whole region of cosmic gas and dust -- the raw material from which stars are born. The nearby gas glows with the characteristic red color of its most common constituent -- hydrogen.

At left center is the Cone Nebula, a region of gas and dust in the shape of a sideways dark cone; the energy of bright stars to the right of the cone is eating away at the sides of this thick dusty region, leaving only a cone of thicker material behind.

To the right of the Cone Nebula, you can see an opposite (larger) cone pattern of bright stars stretching rightward. Some people see the lights of a sideways holiday tree in the pattern of bright stars.

At the bottom center of the image, pointing upward into the bluish emptier region (where the energy of freshly made stars is clearing things out), you can see an odd region of gas and dust that is sometimes called "The Fox Fur Nebula." Click on the picture and take a good look -- can you see the head of a furry red fox pointing upward into the bluish region?

The entire complex of stars and gas and dust is about 2,600 lightyears away, which means the light we see tonight left this region about 2,600 years ago -- a time when humans on Earth lived a much more challenging existence and lifespans were less than half of what we enjoy today.

This remarkable picture was assembled by Dr. Robert Gendler, a physician and amateur astronomer, who is a master at working with photographic information using his computer. The image was constructed from information provided by the Subaru Telescope in Japan and the Digitized Sky Survey, put together by astronomers at the Space Telescope Science Institute from a number of earlier surveys of the sky. To see more information about the photo, see:
http://www.robgendlerastropics.com/Cone-Subaru-DSS.html

You can go to Dr. Gendler's home page at that site and then browse his many other wonderful images. But take a minute and just enjoy a full-screen version of the picture -- you are seeing the same process of star birth that gave rise to our Sun some five billion years ago.

An Amazing Picture of an Active Galaxy by the Hubble and an Amateur Astronomer

This past week, the scientists at the Space Telescope Science Institute released a remarkable picture, which combines Hubble images with those taken by advanced amateur astronomers on Earth, and I'm glad to be able to share it with you.   (Click on the picture to make it bigger.)

In the image, we're seeing the central part of an "active" or disturbed galaxy about 25 million light years away, with the catalog number M106.  You can see the yellow center of the galaxy, crowded with stars whose light blends together.  You can also see its great spiral arms of stars, gently curving away from that center.  They are outlined with blue stars and regions where gas is being heated by stars and glowing red.  Those arms go much further out than the boundaries of this picture.  

But what is especially interesting is that there are also great jets of glowing red gas, which are not part of the flat spiral structure of the galaxy.  Instead, they are at odd angles to the galaxy's disk.  What we are seeing there are great clouds of glowing hydrogen -- the most common element in all galaxies.  But what makes them glow so intensely?  Astronomers have good evidence that they are energized by radiation (not visible to the human eye) coming from a super-giant black hole at the center of the galaxy.  

Neither the black hole (somewhere in the middle of the yellow center) or its rays of energy are visible here.  But when those rays hit the gas that is the "raw material" of such galaxies, they make it glow with a fierce intensity.  

This beautiful photograph was assembled by an amateur astronomer, Robert Gendler, a doctor living on the East Coast, who has made astronomical photography his hobby and his passion.  It's quite a coup to have his photograph used and released by the Hubble scientists.  For more of Dr. Gendler's photos, see his web site at: http://www.robgendlerastropics.com/

If you want to learn some basic information about black holes, you can check out a little video of a 6-minute talk I gave about them at the SETI Institute: http://www.youtube.com/watch?v=7DX_cc-IjpY 

Amateur astrophotographer R. Jay Gabany also contributed to the image.  You can see his image (with less detail) but showing the whole galaxy and really emphasizing the gas excited by the black hole at:
http://apod.nasa.gov/apod/image/1103/lrg_ngc4258gabany.jpg