Scroll down to read this post.

 

Please consider supporting my work here at Behind the Black. I keep the website clean from pop-ups and annoying demands. Instead, I depend entirely on my readers to support me. Though this means I am sacrificing some income, it also means that I remain entirely independent from outside pressure. By depending solely on donations and subscriptions from my readers, no one can threaten me with censorship. You don't like what I write, you can simply go elsewhere.

 

You can support me either by giving a one-time contribution or a regular subscription. There are five ways of doing so:

 

1. Zelle: This is the only internet method that charges no fees. All you have to do is use the Zelle link at your internet bank and give my name and email address (zimmerman at nasw dot org). What you donate is what I get.

 

2. Patreon: Go to my website there and pick one of five monthly subscription amounts, or by making a one-time donation.
 

3. A Paypal Donation:

4. A Paypal subscription:


5. Donate by check, payable to Robert Zimmerman and mailed to
 
Behind The Black
c/o Robert Zimmerman
P.O.Box 1262
Cortaro, AZ 85652

 

You can also support me by buying one of my books, as noted in the boxes interspersed throughout the webpage or shown in the menu above. And if you buy the books through the ebookit links, I get a larger cut and I get it sooner.


1st suborbital launch by Indian private company

Skyroot, a commercial rocket startup in Indian, yesterday became the first Indian company to complete a rocket launch, sending its Vikram-S suborbital rocket on a short flight.

I have embedded the launch below, cued to just before lift-off. The launch itself, which lasted only about six minutes, reached a elevation of just under 56 miles, tested of the rocket’s first stage, as well as a number of other systems.

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 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

3 comments

  • Col Beausabre

    Well, congratulations to them. But to put it in perspective, this was state of the art in sounding rockets 70 years ago. https://en.wikipedia.org/wiki/Aerobee#Development and https://en.wikipedia.org/wiki/Loki_(rocket)

  • Edward

    The announcer, at the 38:29 mark, said that the rocket reached 89.5 km and that 80 km “is commonly defined as the start of space.” This is similar to the U.S. 50 mile definition of space, but a majority of the world considers 100 km as the edge of space, the Karman line. Because the atmosphere becomes thinner and thinner with altitude with no altitude becoming an absolute vacuum, the definition of space is arbitrary.

    The Karman line is named after aeronautical engineer Theodore von Kármán. He postulated that at an altitude of around 57 miles, the atmosphere is so thin that an airplane would be flying so fast in order for the wings to generate lift that half the effect for staying aloft would be the orbital inertia and the other half the lift of the wings.
    https://en.wikipedia.org/wiki/Kármán_line#Kármán's_comments

    I am not sure which airfoil, sweep and other wing shapes, or angle of attack this definition assumes, so different assumptions could give somewhat different altitudes. It seems reasonable to round out to a better number, such as 100 km, 80 km, or 50 miles.

    However, there could have been any of a number of other bases for defining space. Perhaps the altitude at with a person can no longer breathe, or the altitude at which his blood boils. The highest altitude at which an airplane has flown (although this could change over time), or the highest altitude at which a balloon can fly (unladen, of course). Perhaps the altitude that a hollow aluminum sphere with the density of water could make an entire orbit of the Earth without burning up on that orbit, or maybe ten complete orbits. It is all arbitrary.

    Reaching space may not be necessary for any particular mission. The mission may only require a certain time in freefall or a certain atmospheric density. I once worked in a solar astrophysics lab that had launched X-ray telescopes from White Sands, New Mexico, to photograph the sun. X-rays don’t penetrate the thicker part of the atmosphere, so the sounding rocket only had to get above a certain amount of the atmosphere and stay above the corresponding altitude long enough to get a good photograph. (There are now satellites with solar telescopes, so these particular sounding rocket missions have become obsolete.)

  • wayne

    Edward-
    good stuff.

    “It is very cold, in Space”
    https://youtu.be/5vwHLMs04XA?t=12

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 *