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Wow! I've often asked myself why aerospikes didn't take off. There are obvious challenges but the advantage seemed to be worth exploring. This article is the most thorough exploration of that that I've seen. H/T @Erdayastronaut #space #rockets #science ... show more



Yep the technical quantum leap accomplished by the Luna 3 team back in the 1959 is very impressive. #space #history

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Cool story and animation and relevant to the work I'm privileged to be a part of with @b612foundation in helping improve our ability to detect, track, and if necessary avoid collisions with near earth asteroids. #space

Getting cooked only hurts for a while - then you hardly feel it! Great for the arthritis too. ;)



You've probably seen it before (I know I have) but it's cool every time #space #science



An Infrared View of the M81 Galaxy






#nasa #photo #photography #space
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My various open source contributions from July/August. A lot of travel in the way but biggest update was starting my contributions to @b612foundation to help with improving asteroid tracking #programming #space #foss



Lightly used Vostok memory core for sale apparently... #history #space #retrocomputing

I always wonder how someone gets his hands on something like that. And why they sell it!

I have no idea if this is authentic or not.

What do you think, @EdS ?
@Ed S

Core memory from Vostok? Late 1950s? I've no idea if it's genuine! But it looks as if it has been crudely removed so would be a huge project to try to make use of it. (It's certainly a core memory though, and it's pretty old, that much is obvious.)

@sohkamyung @hankg

That said, even Soyuz didn't have an onboard computer initially, so if this was so old, it was not intended for space but for ground equipment.

The Soviets liked automation, but you can do a lot with clockwork and mechanisms, and they did.

http://web.mit.edu/slava/space/introduction.htm

@sohkamyung @hankg

That's a fascinating site on Soviet space computing. Thanks! :-)

@hankg



The astrophotography you can get with backyard equipment is pretty astounding #space #photography




Pair my previous "live" Apollo 11 audio/capcom link with this "live" vis by @AGItweets and their STK tool (they are within 13 seconds of each other) #space #history



Pair my previous "live" Apollo 11 audio/capcom link with this "live" vis by AGI and their STK tool (they are within 13 seconds of each other) #space #history https://www.youtube.com/channel/UCKLvawjjbwpEHmdZyEOeA4A/live



So cool! The Apollo 11 mission in real time (shifted 50 years of course) ( H/T @Christoph S ) #space #history: https://apolloinrealtime.org/11/

Watching the stream of the original launch on and off all afternoon. More space! Fewer cages!

The other thing is, the post-launch was "animation" of the rocket. Now, we can see it in real-time and real life directly from cameras on the rocket.



Every time I see stories like this I want to fire up some mod/sim software and try to simulate it. There must be some open source or public domain software for this but needs a hefty computer...hmm...brain rationalizing... #space #science arstechnica.com/science/2019/0…

There are several packages that will do a light-weight simulation. Universe Sandbox^2 and Space Engine are both commercial packages that include this sort of simulation. However, their simulations are very rough in scale, as far as I know or have seen, and while physically motivated, are not proper particle level simulations. That is, they simulate the interactions using particle models, but the particles are not at the scale of actual atoms and molecules, nor do they experience chemical interactions.

However, there is freely available code for massive scale particulate simulations. Check out https://wwwmpa.mpa-garching.mpg.de/gadget/

For example, the http://icc.dur.ac.uk/Eagle/ Eagle simulations are based on modified GADGET code.

Illustris and IllustrisTNG, http://www.illustris-project.org/data/ and http://www.tn... show more

@Howard C. Shaw, III Thanks! I've dabbled with Universe Sandbox under steam and you can do some neat things but yes it's not exactly what I'm looking for. The above links look very interesting indeed. I found some open source framework but I can't find it now. I'll post it here if I do figure it out though. Thanks for the links!
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I had heard about the laser ranging experiment on Apollo 11 but hadn't read about how it got there or how it went from the ground. We learned a lot from a simple experiment. #space #science

You may also like this article from Physics World which has more info on that experiment and the current challenges with it, like determining distance to the moon in millimetres.

https://physicsworld.com/a/how-high-the-moon/



I really liked his explanation targeted at the every day viewer. Very well done. Also learned something new. I didn't realize the Soviet rockets rotate the launch pad instead of doing a roll program at launch. #space

YouTube: Why do cylindrical rockets roll? (Everyday Astronaut)

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Using spare CPU cycles to give back through "volunteer computing" distributed computing system BOINC #hpc #science #space



Use the Apollo computer to mine bitcoin? Technically yes but at 1 hash every 10 seconds, no. Fascinating coverage of how to develop for it though! #retrocomputing #space

The conclusion nicely puts the power of the AGC into its period context. Not a bad machine for its day given that they required it to be small light and rad-hardened.

@Stephen Gunnell Yeah as they said it was relatively underpowered at 40K add operations per second compared to other computers of the day but other computers of the day were also far more massive. It's pretty amazing how well it performed against microcomputers 10-15 years later. I found this article on benchmarks from 1977. Looking at the integer add test Microsoft's BASIC took 10 seconds to do 1000 additions. At 40 KIPS the AGC would have done it in 0.0125 seconds. If we say that the comparison took up as much time as the addition and the BASIC interpreter is 10x slower than the same routine written in assembly language then we'd still be looking at the AGC being 10x faster. This makes me want to rerun these benchmarks and write them in 6502 Assembly as a comparison lol.



I have seen reports on the nature of the errors (basically computer was asked to compute more than it had capacity for) but not the why or the fail-over modes if the condition persisted. Great article #space #retrocomputing

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India is planning on launching its own Salyut-class space station in the next decade. That's about twice the size of the Chinese Tiangong stations launched to date but a third the size of their next planned one, and 1/20th the size of the ISS. #space