Conscious Choice cover

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.

 

Available everywhere for $3.99 (before discount) at Amazon, Barnes & Noble, and all ebook vendors, or direct from the ebook publisher, ebookit. And if you buy it from ebookit you don't support the big tech companies and I get a bigger cut much sooner.


Fifth mirror for Giant Magellan Telescope has been cast

The fifth mirror, out of seven, for Giant Magellan Telescope (GMT) has been cast by the University of Arizona mirror lab.

With its casting this weekend, the fifth GMT mirror joins three additional GMT mirrors at various stages of production in the Mirror Lab. Polishing of mirror 2’s front surface is well underway; coarse grinding will begin on the front of the third mirror shortly and mirror number 4, the central mirror, will soon be ready for coarse grinding following mirror 3. The first GMT mirror was completed several years ago and was moved to a storage location in Tucson this September, awaiting the next stage of its journey to Chile. The glass for mirror 6 has been delivered to Tucson and mirror seven’s glass is on order from the Ohara factory in Japan.

In time, the giant mirrors will be transported to GMT’s future home in the Chilean Andes at the Carnegie Institution for Science’s Las Campanas Observatory. This site is known for being one of the best astronomical sites on the planet with its clear, dark skies and stable airflow producing exceptionally sharp images. GMTO has broken ground in Chile and has developed the infrastructure on the site needed to support construction activities.

If all goes right, GMT will begin its science work using 4 mirrors in 2020, with the use of all 7 mirrors beginning in 2022. This will be several years before the larger Thirty Meter Telescope and the European Extremely Large Telescope.

Readers!
 

My July fund-raising campaign for 2021 has now ended. Thank you all for your donations and subscriptions. While this year’s campaign was not as spectacular as last year’s, it was the second best July campaign since I began this website.


And if you have not yet donated or subscribed, and you think what I write here is worth your support, you can still do so. I depend on this support to remain independent and free to write what I believe, without any pressure from others. Nor do I accept advertisements, or use oppressive social media companies like Google, Twitter, and Facebook. I depend wholly on the direct support of my readers.


If you choose to help, you can contribute 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:
 


 

Or with a subscription with regular donations from your Paypal or credit card account:


 

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

7 comments

  • wayne

    Cool development.

    Have a sampling of Sky & Telescope magazines from the mid 60’s; The University of Arizona comes up quite a bit, referencing the casting of large mirrors. (their spinning-oven apparatus, is quite impressive.)
    Back then, “Cer-vit” Brand glass from Owens Corning was the new-thing. (1967-1978)

    Am I right to assume the U of A is one of the top places for the casting of telescope mirror’s?

  • Joe

    Note to self, go to Chile to see night time sky!

  • Wayne: The UofA mirror lab is the world’s premier place for casting large telescope mirrors. In fact, no one else does it. You should read my March 2014 S&T article on GMT and the mirror lab.

  • wayne

    Cool. I will follow up. (That’s what I thought, ref U of A.)

    (again, the spinning oven, is very cool)
    UA Mirror Lab Casts Third Mirror for GMT
    2012
    https://youtu.be/uWHkoU2EqyM
    4:08

  • Dick Eagleson

    The UofA Mirror Lab is certainly impressive. But there’s a German company named – amusingly – Schott Glass that has its own proprietary near-zero-expansion glass formulation called Zerodur®. The company has been involved in several large-format astronomy projects including the European Extremely Large Telescope. I don’t know if Schott has the capability of casting monolithic mirrors of 8.4 meters diameter, but they’re definitely a player. Schott Glass seems to be pretty much the Corning of Germany.

  • wayne

    Dick–
    Great historical stuff! You encouraged me doing some mini-research.

    Never looked up “Cervit” before, but I see it’s related to Zerodur and a Russian brand, Sitall.

    I see that Otto Schott developed Borosilicate glass, (‘Duran’ brand) in 1893, 22 years before Corning developed Pyrex brand. And if Wikipedia is to be believed, “Pyrex made its public debut in 1915 during World War I, positioned as an American-produced alternative to Duran.”)

    Back to the GMT–made from “E6 glass” from the Ohara Corporation of Japan.
    http://www.oharacorp.com/group.html

  • Dick Eagleson

    So Pyrex was the “Victory Cabbage” (sauerkraut) of glassmaking, eh? Interesting to know.

    I seem to remember reading that UofA uses a type of borosilicate glass to make its mirrors. Maybe “E6” falls into that category.

    And who knew the Irish were so big in Japan? :-)

Readers: the rules for commenting!

 

No registration is required. I welcome all opinions, even those that strongly criticize my commentary.

 

However, name-calling and obscenities will not be tolerated. First time offenders who are new to the site will be warned. Second time offenders or first time offenders who have been here awhile will be suspended for a week. After that, I will ban you. Period.

 

Note also that first time commenters as well as any comment with more than one link will be placed in moderation for my approval. Be patient, I will get to it.

Leave a Reply

Your email address will not be published. Required fields are marked *