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My annual Thanksgiving/Christmas fund drive for Behind the Black is now over. Though it sagged in the middle, the final week was an amazing barn-burner. My readers responded in an astonishing manner, so that 2024 now looks like it will turn out to be the best year for me financially since I started this webpage in 2010.

 

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Supermassive black hole binary flares as predicted

The distant binary of two super massive black holes, dubbed QJ287, flared within four hours of its predicted time in July 2019, proving the existence of this system.

The central black hole has a mass 18 billion times that of the Sun. The smaller black hole has a mass of 150 million Suns. Its orbit is twelve years long, and when it makes its close approach the interaction between these two monsters causes high energy flares.

We know all this because astronomers have been watching OJ 287 since the 1890s, before they knew what it was. In the intervening century, the system has shot off two outbursts roughly every 12 years, almost like clockwork.

Yet this pattern took time to decipher, as the bigger black hole in OJ 287 is also a blazar. Its black hole, or the disk that feeds it, powers twin plasma jets shooting out along opposite directions, and one of these jets is pointed almost right at Earth. The volatility of this plasma-and-photon stream makes OJ 287 a highly variable visible-light source. It wasn’t until a century after its discovery that astronomers realized that there was a periodic signal hidden within the noise — and that dual dancing black holes could cause it.

Observations in 2005 confirmed those ideas, and astronomers made increasingly precise predictions for subsequent flares in 2007 and 2015. Now, Seppo Laine (Spitzer Science Center, Caltech), Lankeswar Dey (Tata Institute of Fundamental Research, India), and colleagues are publishing observations of the latest flare in the Astrophysical Journal. The authors predicted, and then watched for, a flare expected to arrive in the early hours of July 31, 2019.

QJ287 is 3.5 billion light years away, which makes this prediction and the observations even more remarkable.

Genesis cover

On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.

 

The print edition can be purchased at Amazon. from any other book seller, or direct from my ebook publisher, ebookit. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.


The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
 

"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News

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