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Supernova discovered in Cartwheel galaxy

Cartwheel Galaxy, before and after supernova
Click for full image.

Cool image time! In reviewing a December 2021 image of the Cartwheel Galaxy taken by the New Technology Telescope in Chile, astronomers noticed something that was not there in earlier images, a new supernovae.

The photo above, reduced to post here, compares a 2014 image, taken by the Very Large Telescope, with the 2021 photo. In the lower left of the new image is a bright object not in the previous photo.

This event, called SN2021afdx, is a type II supernova, which occurs when a massive star reaches the end of its evolution. Supernovae can cause a star to shine brighter than its entire host galaxy and can be visible to observers for months, or even years — a blink of an eye on astronomical timescales. Supernovae are one of the reasons astronomers say we are all made of stardust: they sprinkle the surrounding space with heavy elements forged by the progenitor star, which may end up being part of later generations of stars, the planets around them and life that may exist in those planets.

Cartwheel is about 500 million light years away, and because of its bright outer ring is one one of the more unusual nearby galaxies.

Conscious Choice cover

Now available in hardback and paperback as well as ebook!

 

From the press release: In this ground-breaking new history of early America, historian Robert Zimmerman not only exposes the lie behind The New York Times 1619 Project that falsely claims slavery is central to the history of the United States, he also provides profound lessons about the nature of human societies, lessons important for Americans today as well as for all future settlers on Mars and elsewhere in space.

 
Conscious Choice: The origins of slavery in America and why it matters today and for our future in outer space, is a riveting page-turning story that documents how slavery slowly became pervasive in the southern British colonies of North America, colonies founded by a people and culture that not only did not allow slavery but in every way were hostile to the practice.  
Conscious Choice does more however. In telling the tragic history of the Virginia colony and the rise of slavery there, Zimmerman lays out the proper path for creating healthy societies in places like the Moon and Mars.

 

“Zimmerman’s ground-breaking history provides every future generation the basic framework for establishing new societies on other worlds. We would be wise to heed what he says.” —Robert Zubrin, founder of founder of the Mars Society.

 

All editions are available at Amazon, Barnes & Noble, and all book vendors, with the ebook priced at $5.99 before discount. The ebook can also be purchased direct from my ebook publisher, ebookit, in which case you don't support the big tech companies and I get a bigger cut much sooner.

 

Autographed printed copies are also available at discount directly from me (hardback $24.95; paperback $14.95; Shipping cost for either: $5.00). Just email me at zimmerman @ nasw dot org.

5 comments

  • Alton

    Thanks !
    Nice IMAGE i

  • On initial inspection, it appears the outer stars are moving away from the core; because the core is too gravitationally weak? Where is the Dark Matter? Or maybe the core does not have a strong central Black Hole.

  • Star Bird

    And somewhere out there is the Jupiter 2 still trying to reach Alpha Centari

  • Sarge

    Which image is which? I’m assuming the left image is the latter as it shows sharper details. In that image, I see a yellowish bloom, but I’m not sure. However, as western, non-Jewish people (among whom I am not so blessed by G-d to number myself) read chronologically from left to right, I hesitate to assume the left image is the newer image.

  • Max

    Sarge,
    The left picture is the older one from 2014, it’s similar to one taken in 2016 by Hubble.
    https://science.nasa.gov/download/file/fid/14223

    The cartwheel galaxy is a novelty because it’s so unusual, and it’s a favorite for astronomers to try out their new toys on… Even though the picture taken from Chile recently in 2021 is slightly blurry, it is very clear under the circumstances, of using new optical techniques and technology while looking through “our atmosphere” which always blurs.
    You can see a new bright object in the lower left as Zimmerman points out in the article.

    At first I thought it could be a new object in our own galaxy but I find it unlikely. The stars in our galaxy are very bright and obvious.
    Normally a supernova puts out an abundance of neutron radiation which if they look back through their underground detectors data, they might find they captured an anomaly on the date when it occurred.

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