The Pink Planet

Artist's conception of GJ 504b
Image Credit: NASA's Goddard Space Flight Center/S. Wiessinger

Planets are hard to "see" because they orbit around stars that are much bigger and brighter. For this reason, most of the planets we know of outside our own solar system have been detected and studied using measurements and mathematics.

In recent years, though, it's become increasingly possible to detect certain kinds of planets from the direct observations of scientific telescopes, which can use filters to capture infrared radiation and turn it into visible images.

The planet GJ 504b, dubbed the "pink planet" was recently imaged in this way using infrared observations from the Subaru Telescope on Mauna Kea in Hawaii. Most of the planets observed so far by direct imaging have been large and relatively far away from the sun they orbit. The pink planet fits that description, but it currently holds the record for being the least massive planet observed in this way. Even so, it's a large planet like Jupiter.  It's that similarity to Jupiter together with its distance from its sun that makes GJ 504b interesting to astronomers.

If planets like Jupiter form within the gas disc of a young star, as many astronomers have believed, then you'd expect to find such planets no farther away from their sun that the planet Neptune is from our sun -- a distance of 30 AU (astronomical units). Contrary to this prediction, GJ 504b is estimated to be 43.5 AU from its sun. That's difficult to explain with any of the current theories about how planets are formed.

What's easier to explain is why GJ 504b is pink. It's part of a relatively new solar system that was formed only ~160 million years ago, making it 30 times younger than our earth, so the planet is still cooling down. It's lost some of its heat, making it cooler than other planets that have been directly imaged, but it's still hot enough to have a magenta glow.

The Blue Planet

Artist's conception of HD 189733b.
Image Credit: NASA, ESA, M. Kornmesser

If you are in a good stargazing location near the 40th parallel north on a summer night, you may be able to see a faint constellation known as Vulpecula located within the triangle formed by the stars Deneb, Vega and Altair. If you have a telescope or a good set of binoculars, you might be able to see a binary star system that astronomers refer to as HD 189733.

One of the stars in this binary system, which is a mere 63 light-years or so from earth, has a planet designated as HD 189733b. This planet, which was discovered in 2005, is a gas giant that orbits close to it's sun. Planets of this type are sometimes called "hot Jupiters," and HD 189733b has been an object of study because it's the closest planet of this type that we know.

According to NASA & ESA, the sun-facing side of this planet is a furnace, with surface temperatures reaching nearly 2000°F and glass "rain" blowing sideways in up to 4,500-mph winds. It seems unlikely that life could exist under these conditions, yet this planet has provided information that's relevant to the question of whether life may exist on outside our solar system. HD 189733b was the first exoplanet on which water was detected (see NASA JLP article "Steaming Hot Planet" for details), and water is deemed essential for the survival of lifeforms as we know them. In addition to having significant amounts of water vapor, the atmosphere of HD 189733b has been found to contain oxygen, carbon dioxide and the organic compound methane (see NASA/ESA article "Hubble finds carbon dioxide on an extrasolar planet" . If these substances are common on planets outside our solar system, we may someday find them on planets similar to our earth in size and distance from their sun.

HD 189733b has recently been in the news because of it's color. What's special about the color of this planet is that we now know it. Planets are difficult to "see" in the usual sense, so scientists discovered the color in this case from careful measurements and logical inference. If you're interested in knowing more about how this was done, you can read the details in the new release "Hubble spots azure blue planet."

The Art of Mario Mariotti

In going through photographs with my mother, I saw she had downloaded some striking images of hands painted to look like animals. These are the work of an Italian artist, Mario Marriotti (1936-1997), with photography by Roberto Marchiori.

Mario Mariotti was an experimental and conceptual artist who lived and worked in Florence. He began to experiment with painting his own hands in the late 1960's.  Animani, which was published in 1980, shows the colorful representations of animals Marriotti created with his hand art. Subsequent books include Umani, Rimani, Humands, Hanimations, Hand Games, and Hands Off.

Photographs of Mariotti's work also were on display at an exhibition, Animani, from November 29, 2009 through April 11, 2010 at the Instituto degli Innocenti in Florence.  This exhibition was curated by Stefano Filipponi, Francesca Mariotti, Gianni Pozzi and Andrea Rauch, and included workshops showing children how to re-create Mariotti's hand characters

In learning about Mariotti, I discovered a collaborative art project he organized in which the citizens of Florence were invited to submit images which were projected onto the exterior of the Santo Spirito during a performing arts festival.  You can see some of the striking results in  Santo Spirito Projections at the website Fictional Cities.

For your enjoyment, I've provided a slideshow of photographs by Roberto Marchiori of Marriotti's body art.

Astrophotography with FITS Liberator

Modern astronomical telescopes save their raw data in a format known as FITS (Flexible Image Transport System). The colorful images we see from space are created by transforming FITS imaging data into a standard graphical format, such as TIFF, to create a set of files that can be imported into an image editing application such as Photoshop or GIMP. If you know how to use image editing software, you can create your own "pretty pictures" of astronomical subjects by obtaining FITS files (available from a number of sources) and using the FITS Liberator to transform them into TIFF images.

FITS Liberator, developed by ESA/ESO/NASA, was originally a plug-in for Adobe Photoshop.  With the release of version 3, the open-source FITS Liberator has become a stand-alone application, with versions available for both Windows and Mac OS X.

Using FITS data I obtained from NASA's virtual observatory, SkyView, I created the above image of M51, also known as the Whirlpool Galaxy.  There are no doubt better images of M51 around, but this one is uniquely mine. Creating it was a fun learning experience.

You can learn more about FITS data and how to obtain it from The FITS Support Office
at NASA/GSFC and from Image Processing Resources for Astronomy Teaching by by the Astronomy Education Committee of the American Association of Physics Teachers.

Google Custom Search Engines

Google provides tools for creating a Customized Search Engine (CSE) that can be embedded in blogs and other websites to provide specialized searches. In this blog, for example, I might wish to provide an Astronomy search that would respond to a query for "tadpole" with a list of web pages providing information about the galaxy by that that rather than web pages about immature frogs.

Blogger has a Search Box gadget that can be configured to search over a list of links, such as the Space Exploration links listed on the side panel of this blog. I could use that to create a search that would query only the websites in the list, and this might give the kind of results I wanted in most cases. If I wanted to have a search feature like this within a post rather than on the sidebar, I could do that quickly and easily by visiting the webpage for Google's on-the-fly CSE to find code that I can add to my posting using the HTML editor.

The Blogger search box and the on-the-fly CSE are both limited to searching linked sites. With a little more effort, it's possible to create a CSE that is more finely tuned. Using Google's CSE wizard lets you create a gadget that you can embed using an automatically generated code snippet. You can later manage your CSE, editing and refining as you gain experience with its workings. Using this method, I've created a CSE for an Astronomy search and provided a gadget below that you can use to try that CSE. I haven't yet gone much beyond what the wizard creates, so you may or may not find the kind of information you're looking for. To see how it works, try searching on "tadpole," "egg," and "mice" -- and have fun comparing the orange links returned by the CSE with the sponsored links that appear above and to the right of those.

Searching Google+

When a Google+ post is public, that post is available on the Internet for anyone to see.  This allows public posts and their comments to be found using a search engine.

Suppose Ann Able adds a comment about Yosemite Falls to a post that Bob Baker puts on Google+ asking about places to hike and camp in California.  Later on Ann wants to find that comment.  If Ann remembers it was Bob who made the post, she can go into Bob's profile and look through his posts until she finds the one that includes her comment.  But suppose Ann doesn't remember who made the original post -- is there a way she can search Google+ to find her comment?  Yes there is, provided that Bob's post was public.  Using the Google search engine, Ann can enter a query that looks like this:

site:plus.google.com "Ann Able" "Yosemite Falls"

This will result in a search across all public posts on Google+ for those that include Ann's name and the keywords she provided.  The search results will show a list of all the public posts and profile pages (a) that people named Ann Able have created, commented on or shared, and (b) that also include the phrase "Yosemite Falls."  If that's a short list, Ann should be able to find her comment easily.

This same technique can be used to search for public posts and comments on a specific topic.  For example, if Ann is interested in what people are saying in public posts on Google+ about earthquakes, she might use the search query:

site:plus.google.com "earthquake"

Going back to the original example, suppose Ann wants to look at all the comments she's made on Bob's public posts.  So she tries this:

site:plus.google.com "Ann Able" "Bob Baker"

This gives her a listing of all posts and profile pages throughout Google+ that somewhere include the names Ann Able and Bob Baker.  Suppose this turns out to be a long list, in part because there are other people named Ann Able and Bob Baker.  Ann can narrow her search to the posts and profile page of the Bob Baker she knows by using Bob's ID number rather than his name.  To find that number, Ann need only look at the URL for any of Bob's posts or Bob's profile page; the ID number appears in the URL immediately after https://plus.google.com/.

For understandable reasons, these techniques only work for public posts.  Posts that are shared on a limited basis cannot be found in this way, even by those with whom the post was shared.  In the future, Google may provide a way for Google+ users to search both the public and the private posts that have entered their stream, or all the posts they have made, or all the posts they have commented on.  At this time, however, I'm not aware of any way to do these things.

Stellar Spire in the Eagle Nebula

Photo Credit: NASA, ESA, and The
Hubble Heritage Team (STScI/AURA)

I enjoy viewing astrophotography.  Images from space have a special beauty, and I find that contemplating the scope of the cosmos helps to put my own small problems in perspective.

The image I'm posting today shows a spire or pillar in the Eagle Nebula, located in the Sagittarius Arm of the Milky Way galaxy.  I enjoy the NASA news release accompanying this image as much as the image itself:

"Appearing like a winged fairy-tale creature poised on a pedestal, this object is actually a billowing tower of cold gas and dust rising from a stellar nursery called the Eagle Nebula. The soaring tower is 9.5 light-years or about 57 trillion miles high, about twice the distance from our Sun to the next nearest star.

Stars in the Eagle Nebula are born in clouds of cold hydrogen gas that reside in chaotic neighborhoods, where energy from young stars sculpts fantasy-like landscapes in the gas. The tower may be a giant incubator for those newborn stars. A torrent of ultraviolet light from a band of massive, hot, young stars [off the top of the image] is eroding the pillar.

The starlight also is responsible for illuminating the tower's rough surface. Ghostly streamers of gas can be seen boiling off this surface, creating the haze around the structure and highlighting its three-dimensional shape. The column is silhouetted against the background glow of more distant gas.

The edge of the dark hydrogen cloud at the top of the tower is resisting erosion, in a manner similar to that of brush among a field of prairie grass that is being swept up by fire. The fire quickly burns the grass but slows down when it encounters the dense brush. In this celestial case, thick clouds of hydrogen gas and dust have survived longer than their surroundings in the face of a blast of ultraviolet light from the hot, young stars.

Inside the gaseous tower, stars may be forming. Some of those stars may have been created by dense gas collapsing under gravity. Other stars may be forming due to pressure from gas that has been heated by the neighboring hot stars.

The first wave of stars may have started forming before the massive star cluster began venting its scorching light. The star birth may have begun when denser regions of cold gas within the tower started collapsing under their own weight to make stars.

The bumps and fingers of material in the center of the tower are examples of these stellar birthing areas. These regions may look small but they are roughly the size of our solar system. The fledgling stars continued to grow as they fed off the surrounding gas cloud. They abruptly stopped growing when light from the star cluster uncovered their gaseous cradles, separating them from their gas supply.

Ironically, the young cluster's intense starlight may be inducing star formation in some regions of the tower. Examples can be seen in the large, glowing clumps and finger-shaped protrusions at the top of the structure. The stars may be heating the gas at the top of the tower and creating a shock front, as seen by the bright rim of material tracing the edge of the nebula at top, left. As the heated gas expands, it acts like a battering ram, pushing against the darker cold gas. The intense pressure compresses the gas, making it easier for stars to form. This scenario may continue as the shock front moves slowly down the tower.

The dominant colors in the image were produced by gas energized by the star cluster's powerful ultraviolet light. The blue color at the top is from glowing oxygen. The red color in the lower region is from glowing hydrogen. The Eagle Nebula image was taken in November 2004 with the Advanced Camera for Surveys aboard NASA's Hubble Space Telescope."