Hubble celebrates 29 years in orbit
Click for full image.
In celebration of the 29th anniversary of the launch of the Hubble Space Telescope, the Space Telescope Science Institute (STScI) that operates the telescope has released a new image of one of the more spectacular astronomical objects in the southern hemisphere, what astronomers have dubbed the Southern Crab Nebula. I have cropped and reduced the image slightly to post it to the right.
The nebula, officially known as Hen 2-104, is located several thousand light-years from Earth in the southern hemisphere constellation of Centaurus. It appears to have two nested hourglass-shaped structures that were sculpted by a whirling pair of stars in a binary system. The duo consists of an aging red giant star and a burned-out star, a white dwarf. The red giant is shedding its outer layers. Some of this ejected material is attracted by the gravity of the companion white dwarf.
The result is that both stars are embedded in a flat disk of gas stretching between them. This belt of material constricts the outflow of gas so that it only speeds away above and below the disk. The result is an hourglass-shaped nebula.
The bubbles of gas and dust appear brightest at the edges, giving the illusion of crab leg structures. These “legs” are likely to be the places where the outflow slams into surrounding interstellar gas and dust, or possibly material which was earlier lost by the red giant star.
The outflow may only last a few thousand years, a tiny fraction of the lifetime of the system. This means that the outer structure may be just thousands of years old, but the inner hourglass must be a more recent outflow event. The red giant will ultimately collapse to become a white dwarf. After that, the surviving pair of white dwarfs will illuminate a shell of gas called a planetary nebula.
Hubble first revealed this nebula’s shape in a photograph taken in 1999.
The telescope was initially designed for a fifteen year mission. It is about to double that, assuming its last remaining gyroscopes can hold on through next year.
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If Patreon or Paypal don't work for you, you can support Behind The Black directly by sending your donation by check, payable to Robert Zimmerman, to
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Click for full image.
In celebration of the 29th anniversary of the launch of the Hubble Space Telescope, the Space Telescope Science Institute (STScI) that operates the telescope has released a new image of one of the more spectacular astronomical objects in the southern hemisphere, what astronomers have dubbed the Southern Crab Nebula. I have cropped and reduced the image slightly to post it to the right.
The nebula, officially known as Hen 2-104, is located several thousand light-years from Earth in the southern hemisphere constellation of Centaurus. It appears to have two nested hourglass-shaped structures that were sculpted by a whirling pair of stars in a binary system. The duo consists of an aging red giant star and a burned-out star, a white dwarf. The red giant is shedding its outer layers. Some of this ejected material is attracted by the gravity of the companion white dwarf.
The result is that both stars are embedded in a flat disk of gas stretching between them. This belt of material constricts the outflow of gas so that it only speeds away above and below the disk. The result is an hourglass-shaped nebula.
The bubbles of gas and dust appear brightest at the edges, giving the illusion of crab leg structures. These “legs” are likely to be the places where the outflow slams into surrounding interstellar gas and dust, or possibly material which was earlier lost by the red giant star.
The outflow may only last a few thousand years, a tiny fraction of the lifetime of the system. This means that the outer structure may be just thousands of years old, but the inner hourglass must be a more recent outflow event. The red giant will ultimately collapse to become a white dwarf. After that, the surviving pair of white dwarfs will illuminate a shell of gas called a planetary nebula.
Hubble first revealed this nebula’s shape in a photograph taken in 1999.
The telescope was initially designed for a fifteen year mission. It is about to double that, assuming its last remaining gyroscopes can hold on through next year.
I must unfortunately ask you for your financial support because I do not depend on ads and rely entirely on the generosity of readers to keep Behind the Black running. You can either make a one time donation for whatever amount you wish, or you sign up for a monthly subscription ranging from $2 to $15 through Paypal or $3 to $50 through Patreon.
Your support will allow me to continue covering science and culture as I have for the past twenty years, independent and free from any outside influence.
Your support is even more essential to me because I not only keep this site free from advertisements, I do not use the corrupt social media companies like Google, Twitter, and Facebook to promote my work. I depend wholly on the direct support of my readers.
You can provide that support to Behind The Black with a contribution via Patreon or PayPal. To use Patreon, go to my website there and pick one of five monthly subscription amounts, or by making a one-time donation. For PayPal click one of the following buttons:
If Patreon or Paypal don't work for you, you can support Behind The Black directly by sending your donation by check, payable to Robert Zimmerman, to
Behind The Black
c/o Robert Zimmerman
P.O.Box 1262
Cortaro, AZ 85652
Or you can donate by using Zelle through your bank. You will need to give my name and email address (found at the bottom of the "About" page). The best part of this electronic option is that no fees will be deducted! What you donate will be what I receive.
I was SOOO mad when they they finally figured out why the first pictures were fuzzy.
Story Musgrave and crew restored my faith….for a few more years.
Pictures like this show why it is tragic that we are going to lose Hubble and why it’s a sin that we don’t have a replacement even on the drawing boards (metaphorically, I realize it’s all CAD now, but that’s two years of mechanical drawing, a year of engineering graphics and a student job as a draftsman speaking)
The story has it , the corrective optics (COSTAR) installed by the Astronauts wasn’t actually needed. They figured out how to correct HST’s mirror shape error with updated s/w processing before the “rescue mission’ took place. so the story goes….
Even money says once Starship is flying regularly, Musk personally pays for a mission to retrieve Hubble for the Smithsonian.
Orion314: You are exhibiting a lack of knowledge about COSTAR, Hubble, and its repair. COSTAR was needed to repair at least one instrument on Hubble. When they installed it in 1993, along with a new camera, Wide Field Camera 2, it made useful all of Hubble’s instruments.
In later years the instrument that COSTAR fixed was replaced with a new instrument with its own corrective optics, then making COSTAR unneeded. They then used COSTAR’s slot to put in another new instrument, maximizing Hubble’s capabilities.
Also, corrective optics before the repair never fixed anything. It produced better images, but with many artifacts that caused many research problems. The repair was essential.
I wish people would do a little research before talking. It would make whatever you say more creditable.
Just passing along a story I recall from that time.As I pointed out,I was refering to updated S/W image processing, not new H/W.
Orion314: “Just passing along a story” that you haven’t sourced and you have no idea is true is the equivalent of fake news. It is a bad habit that too many people do nowadays, far too nonchalantly. It can do real harm, not only to those you might be maligning but to yourself. As the old saying goes, better to remain silent and be thought a fool than to speak and remove all doubt.