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Readers!

 

My July fund-raising campaign to celebrate the fifteenth anniversary since I began Behind the Black is now over. I want to thank all those who so generously donated or subscribed, especially those who have become regular supporters. I can't do this without your help. I also find it increasingly hard to express how much your support means to me. God bless you all!

 

The donations during this year's campaign were sadly less than previous years, but for this I blame myself. I am tired of begging for money, and so I put up the campaign announcement at the start of the month but had no desire to update it weekly to encourage more donations, as I have done in past years. This lack of begging likely contributed to the drop in donations.

 

No matter. I am here, and here I intend to stay. If you like what I do and have not yet donated or subscribed, please consider supporting my work here at Behind the Black. You can support me either by giving a one-time contribution or a regular subscription. There are four ways of doing so:

 

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LightSail deployment scheduled for Tuesday

Assuming all goes well with the orbital preparations today, LightSail will perform its test deployment on Tuesday at 11:44 am.

If successful, this deployment will achieve several significant engineering firsts, the most important of which will be to have demonstrated that a cubesat can be used for such a task. Proving that fact will increase their commercial usefulness for future space endeavors.

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 or from any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. 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

7 comments

  • BSJ

    What is the objective of this mission? Just deploy the sail, or is the sail supposed to be used to change the orbit or something?

  • The objective is to test the deployment, not use the sail. They can’t test the deployment technique on the ground, but need it to be in orbit to do so. Hence this engineering flight.

    It might be that they will try to use the sail afterward, but I suspect not, as it is in a low orbit that will decay quickly.

  • Tom Billings

    To expect to climb the gravity well from LEO with a lightsail will require sails built *in*orbit*, and made sacred. “Holy” sails are going to be sails made as Freeman Dyson proposed some decades back. Take a Drexlerian sail made by vaporizing aluminum onto a smooth sheet of frozen water, above about 30 nanometers thickness. Drill closely spaced holes in this sail with electron beams small enough that 95+% of the light still reflects from what is left as “aluminum chicken wire”. This will allow air molecules to pass through the sails at LEO altitudes, eliminating the vast majority of the drag of standard lightsails.

    This demonstration is about deployment. Cubesats that can *make* lightsails *in*orbit* should be the next step!

  • PeterF

    wouldn’t they be more properly “holey”?

  • Tom Billings

    Awww, you’re no fun! ;-)

  • Jeff Poplin

    Deployment now scheduled for Wednesday, June 3.

    Test images from camera are coming in.
    http://www.planetary.org/blogs/jason-davis/2015/20150601-lightsail-partial-images.html

  • pzatchok

    I am just not a fan of the light sail idea.

    It can not work outside the solar system. Not enough light for thrust effect.

    And the use of it inside the solar system is extremely limited.

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