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1.30.2005


What's It Like
Inside a Black hole?



The Milky Way's Black Hole
Courtesy European Space Agency's Integral Mission
For a bigger version click Here


Back when I used to lecture in the planetarium I would solicit questions from the audience at the end of each presentation. Every once in a while somebody would ask me what it's like inside a black hole.

Trick question, right?

Well, probably for some of the more smart-aleck audience members it was. But, I always had an answer. I'd go into a little discussion about how we don't know exactly, and based on a number of factors (including the laws of physics, some Einsteinian laws, etc.), we'll probably never have a chance to explore the inside of one (and, if the gravity is so strong that light can't even escape, is the inside of a black hole REALLY a place we want to be?). Following that there'd be a silence as people digested the idea of "being there". Then we'd get into a discussion about what it be like to be right next to a black hole, which is a lot easier to describe, even if it IS a shrieking maestrom of radiation and searing temperatures.

At the time I was first in school, back in the dark ages of the early 60s, black holes were sort of a mathematical curiosity, a physics problem for which we didn't have any good examples. That all changed with the advent of telescopes and detectors able to "see" the effects of black holes, including the jets that spray out from the vicinity of one as matter (stars, gas, dust) spiral into the hole. Moreover, black holes have gravitational effects on nearby stars and gas and dust that we CAN track with spectroscopic observations of the light emanating from the nearby region.

Which brings us to the center of our own galaxy, where a supermassive black hole about a million times the mass of our Sun lies hidden by gas and dust clouds and star clusters. This SMBH (for short), also known as Sagittarius A* (or SgrA*), radiates tremendous amounts of energy which we can detect in gamma rays. As luck would have it, we have a spacecraft called INTEGRAL that "sees" that radiation. In the image above, INTEGRAL shows us a gamma-ray view of the region near the center of the Milky Way.

Now, SgrA* is a pretty quiet and harmless black hole, and isn't quite the powerhouse of radiation that others are—like, say, the black hole at the center of galaxy M87, which sports a very active jet. Yet, in the past, the Milky Way's resident black hole has been restless, and whenever it acts up, the surrounding clouds light up with the evidence.

Right near SgrA* is a cloud of gas called SgrB2, and the two are about approximately 350 light-years apart. Sgr B2 is being exposed to a blast of gamma rays emitted by Sgr A* that went off about 350 years ago. The cloud absorbed the radiation and has been emitting it. Interestingly enough, the astronomers studying the data think that the whole outburst took at least ten years, possibly longer. And they're using their studies to figure out how often and how strongly "our" black hole turns on, radiates, and then turns off again.

I have to admit, it's pretty heady growing up knowing that these weird things that scientists once thought were probably rare are now found all over the place (in many galaxies and at the death scenes of supermassive stars). And, I find it very cool indeed that we can study the near-black-hole environment and learn so much about them.

posted by CCP on 1/30/2005 02:23:00 PM | * |

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1.27.2005


The Comet, the Celestial Ladies, and an Old Friend



Image of Comet Machholz by Gerald Rhemann.


The passage of Comet Machholz near the Pleiades a couple of weeks ago reminded me of a project I spent a number of years working on in the late 1980s and early 1990s—the International Halley Watch Atlas of Large-Scale Phenomena— a compendium of Comet Halley images. The whole thing began when applied for a job as a research assistant on an IHW team at the university. I spent the next several years measuring and studying many, many images of Comet Halley, teasing out details about its plasma tail structures. Our interest was to chart the changes in the plasma tail as the comet sampled various "regimes" of the solar wind, and use those changes to understand how the solar wind affected the charged particles in the plasma tail. It got to the point that I could look at an image of Comet Halley and tell you exactly when it was taken (date and time) and tell you something about whether or not its plasma tail was about to disconnect or was rebuilding itself after a disconnection event (when the plasma tail would break off and then re-form in response to changes in polarity in the solar wind stream).

So, it was with a great sense of memory and history that I looked at this image (and many others) of Machholz as it passed near the Pleiades star cluster in the January sky. For one thing, it was clear that the comet had just undergone a disconnection event. The new tail was sprouting out from the coma and the remnants of the old tail were streaming out in a clump highlighted against the Pleiades. (The dust tail, by contrast, is the yellowish streak that seems to point roughly downward in this image.)

Even cooler, I ran across this image from Gerald Rhemann, one of Austria's best-known comet chasers and astrophotographers. I became quite familiar with Gerald's work (along with his collaborator Michael Jaeger) during my Halley years, and in my subsequent role as coordinator for observations for the Ulysses Comet Watch network in the early 90s. It's a double blast from the past—comet plasma tails and the fantastic work of a photographer whose work I've long admired. The scene is stunning, combining my old research interest with one of my favorite star clusters in the winter sky. Sometimes astronomy doesn't get any better than this!

posted by CCP on 1/27/2005 10:15:00 PM | * |

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1.26.2005


Gateways to the Cosmos



Gemini North Observatory on Mauna Kea, Hawai'i, courtesy
Gemini Observatory.


Observatories are our windows to the universe. Through their gates, we can move out to distant realms and explore the lives and deaths of stars, the evolution of galaxies, and the origins of the cosmos. Astronomers used to travel to observatories quite regularly to do their work, which made them appreciative of the distant, lovely places where these facilities are built.

Now you don't have to go to an observatory to get your data as much as in the olden days (or nights, actually), because many facilities are automated and can deliver your data across the Internet (or in digital format on tape or disk) very quickly. We are in the age of remote observing, and it seems to me to be a natural evolutionary step for astronomers to take. Yet, something is lost, something described in Patrick McCray's book Giant Telescopes as a romantic link to a past time of astronomical discovery when lonely men (they were almost always men) wrestled with great astronomical beasts atop cold mountaintops. Many important discoveries were made by those men and their machines, and their hard work has led directly from the ways of the "old days" to the methods of today's astronomers.

Still, that shouldn't stop us from appreciating the beauty of the mountaintops, even as we revel in the rest of the cosmos that is revealed from their observatories. I think every astronomer should go up a mountain at least once in his or her career, and not just for the heady experience of trying to take data at high altitude (although that's a hoot, too). You gain a new perspective on the world when you go up the mountain. You get to feel as if you could fall up to the stars when you step outside from the control room during an observing run. And, then there's the rush you get from knowing that the night you're up there, you're one of a handful of human beings across the world who are doing what you're doing.

In that sense,then, observatories are truly gateways to discovery. It's just that what you discover isn't always up in the sky!

posted by CCP on 1/26/2005 02:34:00 PM | * |

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1.23.2005


Homesteading on Titan




I suppose it's fitting that during the week of major discoveries on cold, methane/ethane-slushy Titan that a snowstorm would arrive to remind us of winter cold here on Earth. However, what some of us are experiencing in the snowstorm currently enveloping the New England area of the U.S. would be a balmy day on Mars and a downright searing heat wave on Titan! Imagine the report from The Weather Channel(tm) if we lived on Titan:

Folks out near Dragon's Head are well advised to stay inside for the rest of the day, as a strong cold front is bringing methane flurries. Temperatures could plunge to -183 Celsius, with wind chills making it feel like -190. Watch out for lake-effect accumulations around the shores of Snowy Sea. And people, if you don't have to be out, we advise you stay in and stay warm!

It's kinda fun to think about "extreme" weather on other planets and how we'd deal with it if we lived there. Of course, life on Titan (for humans) would be a challenge of major proportions. Just how would we build habitats? Out of what? And why would anybody want to live there? There's another good science fiction story there, just waiting to be written!



posted by CCP on 1/23/2005 11:51:00 AM | * |

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1.19.2005


Building Sedna



Courtesy of Dan Durda and Southwest Research Institute


Remember a year or so back when the largest Kuiper Belt Object to date, named Sedna, was discovered? It shifted planetary scientists' attention to the origin and evolution (and existence!) of large, planetoid-sized objects out beyond Pluto. They've been working out the fine details of Sedna's orbit for a while now, using sophisticated models of the early solar system formation. One of the outcomes of this work is the idea that this nearly-Pluto-sized "worldlet" actually formed in place in the frigid deep-freeze of the outermost solar system. Originally scientists thought it was assembled farther in toward the Sun during the early days of the system's formation, and was somehow ejected out to its current position.

Why does where Sedna formed matter? Astronomers have longed assumed that planetary formation took place in a rather smaller region of the original solar nebula. If Sedna was created from the collisions of smaller bodies out in the "sticks" of the solar system, then the planetary factory is bigger than everybody suspected. It also means that the Kuiper Belt, which hosts countless bodies at what used to be called "the edge of the solar system" is really part of a larger region called the Kuiper disk and played a much more prominent role in the formation of planets and moons.

The modeling that led to these conclusions was done at the Southwest Research Institute in Boulder, Colorado. In the press release they sent out announcing this work, the institute's Executive Director for Space Studies, Alan Stern (a former colleague of mine from the University of Colorado), talked about some of the assumptions they made in constructing their model: ""The Sedna formation simulations assumed that the primordial solar nebula was a disk about the size of those observed around many nearby middle-aged stars — like the well-known example of the 1,500-AU-wide disk around the star Beta Pictoris."

It's interesting work because it gives us a whole lot MORE insight into the infancy of our own solar system, in particular the formation of planets from smaller planetesimals. And, chances are if Sedna formed where the astronomers think it did, then there could well be more large planetoids circling around out there with it — and that what we used to think of as the "emptiness of the outer solar system" isn't so empty anymore. As astronomers learn more about the Sun's outermost retinue of planetesimals, they are finding more clues to what conditions were like early in the history of solar system.

posted by CCP on 1/19/2005 11:21:00 AM | * |

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1.15.2005


The Sights and Sounds of Titan!



Courtesy the Cassini-Huygens Mission Mission to Saturn and Titan.


Yesterday I returned home from the AAS meeting. It was a long flight day, and I logged some airport time waiting for flights. So I decided to try out the ever-present T-Mobile wireless hotspots to see if I could check on the progress of the Huygens data from Titan and the Cassini-Huygens mission via their websites. I'm sure everybody's seen the images by now. We're in a great age of planetary exploration when we can tune in to the latest pics from Mars and Saturn every day, if we so wish it! I can pretty well guess how excited the scientists were to find out that their probe had settled down to the surface of Titan and had returned a treasure trove of 90 minutes worth of data before falling silent.

And what a collection! I'd always pictured Titan as this place with hydrocarbon-sludge oceans and maybe a frozen surface. So, the pictures were not a total surprise in that regard. But it was still exciting to see actual rocks and a surface. A friend of mine called this morning and said that it reminded him of Venus, only many hundreds of degrees colder!

If you browse around the Cassini-Huygens web site, you'll find more pictures, plus a neat page of "sounds" from Titan. It will be interesting to see what else they post in the next few days that will shed more insight into a world that once was hidden and veiled—and still holds surprises for us all.


posted by CCP on 1/15/2005 01:40:00 PM | * |

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1.13.2005


Hubble Finds Infant Stars: AAS Story




Courtesy Hubblesite.org


Today's the last day of the AAS meeting, and things are winding down. Yesterday was a busy one—I gave a poster presentation about using arts, poetry, literature, music, and science to teach astronomy in planetarium shows, and spent about 6 hours standing there talking with astronomers interested in how we do what we do. (If you want to read the paper, you can find it at Adventures in the Dome Trade on our Loch Ness Productions web site (it's a PDF file)). Lots of good interactions and I had the opportunity to talk to a lot of colleagues from my days in the research world and several planetarians who stopped by!

One of the stories released at this meeting is about this lovely star birth region in one of the Milky Way Galaxy's neighboring galaxies—the Small Magellanic Cloud. The view is so sharp that you can see this small population of infant stars perhaps only a few million years old, from a distance of 210,000 light-years! If you want to read more about it, click on the link above.

There was also a flurry of news about the recently launched SWIFT mission, which is out there observing gamma ray bursts, those mysterious pinpoint brightenings in gamma rays that are second only to the Big Bang in total energy output. They last a few milliseconds and likely are signals from the birth of another black hole in the distant reaches of the cosmos. For more information you can browse over to the Swift web page.

If you want to see more astronomy stories from this meeting, click on over to this page o' links.

posted by CCP on 1/13/2005 01:14:00 PM | * |

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1.12.2005


Dusting for Clues at AAS



Courtesy Gemini Observatory


One of the results reported here at the AAS meeting is what astronomers think are almost "real time" views of collisions of planetoids in a dust disk surrounding the star Beta Pictoris. It turns out that when these little bodies crash into each other they send out clouds of particles, which then dissipate. Judging by the rate of dissipation and the extent of such a cloud, astronomers have been able to figure out that the cloud of material they've observed in Beta Pic's circumstellar disk came from a collision that could have happened as little as a hundred years ago! This artist's conception shows what the system would look like if you could be on the scene, viewing it with infrared-enhanced eyes. If you want to see additional images and discussion, point your browser to the link above and enjoy!

posted by CCP on 1/12/2005 03:37:00 PM | * |

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1.10.2005


Exploring the Universe with Astronomers



Courtesy of Space Telescope Science Institute Heritage Group


I'm at the American Astronomical Society meeting in San Diego, one of two annual AAS meetings that bring together astronomers from around the world. I always have a blast at these things and come away with exciting findings and ideas from astronomers. So, there were several big findings released on Monday, including this amazing image from Hubble Space Telescope. It's a barred spiral called NGC 1300, and if you download the image from the link above, you'll see starburst regions, streamers of gas and dust, and millions of blue supergiant stars that will last only about 10 million years before exploding as supernovae!


You never know when you get a chance to stand next to a galaxy!


Keep checking back here this week and I'll try to post something cool and exciting every day!

I've also posted a page of headlines and links to some other interesting science stories HERE!

posted by CCP on 1/10/2005 08:41:00 PM | * |

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1.04.2005


Fireworks for the New Year



Courtesy Gemini Observatory.


For a couple of weeks before the holidays I spent some time working with the guys out at Gemini Observatory on the press release that accompanied this great picture of NGC 6946. It was taken using the Gemini North telescope on Mauna Kea, Hawaii on August 12, 2004 and I first saw it sometime last fall when the public information office sent it to me as part of a press package they wanted me to edit. Cool stuff, really! If you look at the image, you can make out dozens and dozens of red splotches of light scattered throughout the spiral arms. These are starbirth regions, and over the next millions of years they'll be ablaze with the light from hot young stars.

What you don't see in a single image like this, however, is the incredibly active rate at which massive stars are blowing up as supernovae. In fact, this galaxy has stars that have been, as scientist Jean-Rene Roy says, "exploding like a string of firecrackers!"

That makes sense for a galaxy that is just swarming with star-formation sites. Eventually all those hot, massive young stars evolve into old, massive ones that are the most likely to explode as supernovae. If we had incredibly long lifetimes, like say billions of years long, we could watch NGC 6946 go through wave after wave of star formation, followed by the protracted struggles of star death.

Unfortunately we don't, but luckily we have telescopes like Gemini to give us snapshots that show us the evidence for stellar evolution on a grand scale in a neighboring galaxy!

posted by CCP on 1/04/2005 09:36:00 PM | * |

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1.03.2005


Well, Look Here!



Courtesy Cassini-Huygens Mission.


Right before Christmas NASA JPL put out this image of what looks like Jupiter. Nice swirly cloud belts, a giant storm, cloud spots—all the things we're used to seeing in the upper cloud decks of the solar system's largest planet. Only thing is, this is Saturn! Good old bland-looking Saturn (the way we got used to seeing it in Voyager images) has some fascinating weather patterns of its own, reminiscent of Jupiter's.

This view was possible by using Cassini's narrow angle camera, outfitted with filters that made it possible to cut through the methane haze that can keep us from seeing the action farther down.

This kind of stuff is what's so amazing about exploring the solar system with robotic probes. Every picture is like opening up a gift—you don't always know what's going to come out of the box, and when it's something like this, you're amazed and delighted. For the scientists on the Cassini-Huygens mission, that present arrives daily, and in fact, many times daily, dressed up as ever-more-detailed information about Saturn and its retinue of moons.

In less than two weeks, the Huygens mission will drop down through the clouds of Titan, Saturn's largest moon, and give us the first-ever detailed looks beneath that heavy shroud. We can only hope it will be at LEAST as interesting as the new stuff we're finding out about Saturn!

posted by CCP on 1/03/2005 10:42:00 AM | * |

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1.01.2005


Happy New Year, 2005!



It was only yesterday we were all making our resolutions for the new year. Of course the world's problems straddle the clock's tick from midnight to 12:00:01 taking 2004 into 2005. Against the backdrop of continued strife, the plight of the tsunami victims in Asia and Africa, and other issues, skygazing might seem to be a frivolous activity. But it's not. It's part of our lives. And it's amazing sometimes how a short stroll through the universe can change one's perspective on life here on Earth.

All this stuff that we humans do happens under that starry sky. We often credit our "lucky stars" when things go right, and blame "the planets" or something like that when life doesn't go the way we want it to. But, in truth, the stars and planets and galaxies are going about their business of shining, evolving, revolving, rotating, and all the other things that celestial objects do. Any effect they have on us is mostly imagined, except for the pleasure we get from watching them, exploring the processes that make them what they are, whether we are doing it professionally or simply stepping out to look up for a few minutes in the evening or early morning. It's the only free show we never have to pay for—they're always out there.

posted by CCP on 1/01/2005 10:22:00 AM | * |

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