Lesson Learned: Trip to Nagasaki

  1. It doesn’t get easier: This was my second trip to Nagasaki. Compared to Hiroshima, Nagasaki isn’t as exciting. Peace museum is the top attraction in Nagasaki city. Having visited the museum already, I thought it’ll be OK for me. It wasn’t. Like the first time, my insides went hollow. Nuclear weapons don’t belong on earth.
  2. Driving is scary: Public transport in Nagasaki isn’t like the rest of Japan. It feels like Nagasaki could’ve used some modernization like rest of Japan. You can get around but takes a lot of time in public transport. And google maps isn’t spectacular here. A lot of info isn’t available on “Tourist Apps”. So driving was my choice for this trip. That was mistake. driving around trams is scary. The roads are narrow. Turns are sharp. I don’t think I’ll be driving again in Nagasaki city.
  3. Parking is f*&^%ing expensive.
  4. Take the toll free road: Driving out of Nagasaki was a scene from heaven. Since we had time, we decided to take the long way back home. we chose the toll-free route back to Kitakyushu. Wish I had more time. There were multiple spots where I slowed down or wanted to stop and take picture. The scenes were from heaven.
  5. I recommend hotel forza: The entrance to the hotel is hard to find. Take a taxi and continue searching on foot once the taxi drops you of. If you manage to find the entrance of the hotel, you’ll be rewarded adequately. If you are driving, get out of Nagasaki, find a hotel elsewhere.

BadCoin Giveaway

I’m doing a spring cleaning. Both online and offline. I’m giving away my spare screwdriver set, 3D glasses, drones etc. Digitally, I’m giving way my BadCoin. They are worth a stagerring $0. It is predicted their value will quadrupple in a year and be worth a massive $0. Joking aside, they are an easy way to understand wallet functionality. They are yours to play with now.

Wallet address:


I don’t understand the keys to my wallet. The backup file is a DAT file. I could not extract the key from it. I hope you guys will have better luck. The file is on my GitHub. Just search with the wallet info.

Have fun.

Help me grow

Hello internet. I have a favor to ask.

One of my goal in my life is to spread knowledge and education to those who desire it. Since I specialize is Satellite Systems Engineering, I would like to help others who wish to follow similar path.

Now time is a limited resource. I cannot endlessly write articles on the topic and hope someone finds it useful. Therefore I have decided I will resume google analytics on this site, to find out what my audience is most interested in. Also, if you have any suggestion for improvement, leave them in the comments.

By the end of 2021, I wish to participate in forum promoting science and technology. I don’t know yet if the appropriate platform is already there. If not, I’ll also need to built it. Wish me luck.

Nvidia buys ARM: from a perspective of a developer?

Although the deal isn’t done yet, the announcement has been made. Now, the whole news cycle is dominated by Nvidia. Here are my two cents as a developer uses these chips for development. 

First, Nvidia is a big player when it comes to AI and machine learning. I cannot think of any competitors to CUDA cores. If Nvidia has the right intention and plays their cards right, I wouldn’t be surprised if some of Nvidia’s desktop-level features trickle down to ARM SoC. Since the majority of smartphones uses some ARM based chips, this could be revolutionary. 

Second, Nvidia’s competitor AMD has one advantage. AMD also makes CPU along with GPU. With ARM, Nvidia now has a way to come up with specialized products to further reduce AMD’s market share. We might more efficient systems overall. 

Third, Nvidia has a bad reputation with the Linux community. Nvidia never really cooperated with open source community. As an open-source supporter myself, I’m afraid of the changes  Nvidia will bring in the future. As a company, I can see Nvidia growing. If I had the money, I would buy their stock now. But as they grow bigger, they might bring negative results for the open-source community. 

Fourth, speaking of open source, Nvidia is a US-based company. That would mean Chinese phone manufacturers will not be able to use ARM in the future. Does this mean RISC-V will finally get the boost I was expecting? 

Waiting patiently to see how this turns out.

This month is Space: August 2020

The month of August was dominated by Elon Musk. With multiple success, he’s company has been the main highlight for this month’s review.

Compared to July, August has been really eventful. I talk about 2 new space comapanies, WrapSpace and TRSC. India and Nigeria has a new MOU. Amazon get clearance for their satellites.

Due to formatting issue, I’m no longer pasting the entire post on the website. Instead, I’ll pos the google doc link. Here is the link to google doc: https://docs.google.com/document/d/1UNmB1qAkOkD7NtkmhdZFFpAme5HLSirCpLoHoxG7YtU/edit?usp=sharing

This month in Space: July 2020

Hey guys, sorry for the delay.

Actually, I’m really busy trying to find a job right now. So not enough time to put the series together. Also, due to formatting issue, I decided, from this month, I won’t post the whole thing on the website. I’ll post a link to the google doc.

Not many news to cover for July. We have 2 significant launch. Both to Mars. For the majority of the post, I rant about peaceful use of space.

Link to the google doc: https://docs.google.com/document/d/1on9xNmzqSRX-7gq4tKnlgAEScR_7w07QU9ZOPcM7N4k/edit?usp=sharing


Thank you members IEEE Aerospace and Electronic Systems Society at BRAC University. Although I was online, it was pleasant to interact with you all via Q/A.

If you still have questions unanswered, you can always shoot them at: maisun.i.monowar@ieee.org

Hello everyone, with the start of the IEEE Aerospace and Electronic Systems Society BRACU Student Chapter, we are very…

Posted by IEEE Aerospace and Electronic Systems Society BRACU Student Branch Chapter on Wednesday, July 22, 2020
Event poster
Space Expedition : BRAC Onnesha | IEEE AESS

IEEE AESS presents to you it's very first event – Webinar that is focused on BRAC Onnesha! Our chief guest is Professor Dr.Arifur R. Khan. In addition, meet the very pioneers of BRAC Onnesha! There's a Q/A session after the main event. You may post your queries in that chat below and we'll try our best to have them answered!

Posted by IEEE Aerospace and Electronic Systems Society BRACU Student Branch Chapter on Saturday, July 25, 2020
Recorded Video.

Depreciation of smartphones

I noticed this month, my cell phone’s battery is dying. I don’t have the statistics of my battery cycling, but it makes sense. Although I’ve been cautious to preserve battery life, it’s been 2 years since I bought my phone. Only naturally I need a replacement now. That got me thinking, should I just buy a phone that I can throw away every year?

The phone I have right now is about $500 phone. It’ll probably last until the end of this year. So roughly, $200 depreciation for every year. So how about I buy a phone with this $200 and not bother when the phone dies. Cheap phones are great nowadays. Sure, occasionally they give you a headache. But if you are just checking your emails and receiving text, they are more than enough. Or, how about buying a $400 phone for 2 years. So the yearly cost is the same, but you get so much more. Buy an OnePlus phone and I don’t think you’ll be missing much. You have everything you could possibly need. Third option bit more luxurious. How about you buy a phone as soon as it comes out. Then keep watching the market. As soon as the second-hand market value goes below a threshold, you sell it. That way, you get the best of both world, with some risk. Your phone value may go to zero. You may break it, or lose it. All options seem like a good one. So I tried to post a poll on Facebook. Here is the result,

Option 1. Buy a $400 phone, use for 2+ years, throw away
8 votes

Option 2. Buy a $200 phone, use for 1+ year, throw away
9 votes

Option 3. Buy an $800 phone, use for 1 year, try to sell for $600
3 votes


total 8+9+3+8 =28 votes

32% of people for option 2
29% of people chose option 1
10% of people chose option 3
29% of people would do something different.

In short, most people will buy the cheapest phone they can find. Rest will buy a sensible phone and hold on as long as possible.

Makes sense. I checked the online public data on smartphone value depreciation. iPhones do depreciate, but a lot slower compared to Androids. Android phone loses a large chunk of their value as soon as you unbox.

I looked at the amazon price history. Note8 is selling for 50% of their original value. Note10 lite has already lost 40% of its value in 6 months. Some phones are refurbished. Also, comes with no warranty.

Here’s what I think,
This time, I’ll fix my phone for $100. A new battery should keep the phone running for 2+ years. When the phone dies, I’ll buy something like Note 10 lite. A phone which is cutting edge, but already selling for less in the refurbished market. Or buy a phone like Note 8. A 2-year-old model but great features and low price.

This month in Space: March 2020

📹 🔊 Indian astronaut starts training

Source 1:

Indian Astronaut Candidates Start Training In Russia

Source 2:

Virgin Galactic gearing up to start selling suborbital spaceflight tickets again

For some reason, India, Pakistan & Bangladesh announced that they will send Astronauts into space. Bangladesh just made the announcement this year. Pakistan plans to team up with China in this regard. As far as I know, only India out of these three countries have taken actionable steps. 

After a thorough selection process, the four Indian Air Force fighter pilots became the ISRO’s candidates for the planned Gaganyaan human spaceflight mission.

The 12-month training programme began on Monday, 10 February 2020. The programme includes comprehensive and biomedical training of the Indian candidates, which will be combined with regular physical tests and exercises.

I hope they continue this process. If the goal is to send people into space for publicity, I would say that it is a terrible way to spend your money. If you want to send your pilots into space, just use Virgin Galactic. They will go to space for a couple of hours for cheap. 

I’m not against human expeditions. All I’m trying to say is, make it count. Training astronauts is an expensive process. It is also very stressful for the astronauts. I was fortunate enough to shake hands with 2 Japanese astronauts. They both trained in the USA. When asked about the most challenging part of his training, Dr. Takao Doi said, it was uncertain. He trained for months not knowing if he will ever fly on a mission. Just recently, two Russian Cosmonauts were switched with the backup team. One of the Cosmonauts had medical conditions for which he could not fly. The agency decided to switch the pair with the backup personnel. That’s how challenging and risky human space flight is. As an ordinary citizen, I would like to know the long term goal of my government. What Bangladesh hopes to achieve by sending a man to space. 

Citing medical reasons, Russia’s space agency announced Wednesday that it is replacing two cosmonauts who were scheduled to fly on the next Soyuz mission to the International Space Station in April with backup crew members.

Russian cosmonauts Nikolai Tikhonov and Andrei Babkin were training for launch April 9 from the Baikonur Cosmodrome with NASA astronaut Chris Cassidy on the Soyuz MS-16 spacecraft.

Roscosmos, the Russian space agency, said Wednesday Tikhonov and Babkin — both rookie cosmonauts — will be replaced by cosmonauts Anatoly Ivanishin and Ivan Vagner on the Soyuz MS-16 mission. Cassidy’s assignment to the mission remains unchanged.

📹 Live long and prosper

In case you missed it: Have you seen the logo for the US Space force? Does it remind you of someone? Captain Picard maybe?

Screenshot from: https://twitter.com/mirikramer/status/1220822476621598720?s=20 

📹 🔊 Space Force gets $15.4 billion in 2021 budget request

That’s about 60% of what the White House allocates to NASA.

That money will be put to a variety of uses. For example, $1.6 billion is earmarked for three national-security launches, $1.8 billion will go toward Global Positioning System projects and $2.5 billion will support “space-based overhead persistent infrared systems,” Department of Defense (DOD) officials wrote in a press release today. 

The total DOD allocation in the request is $705.4 billion.



That is a lot of money. Also true, the US is a major world power. This is probably a fraction in contrast to their national budget. I only bring this up to point out how important it has become to have your presence in space as a part of national security. Just as a reminder, US is not the only country with a space force. France, Russia, China have branches of armed forces dealing with space aside from their space agency. 

🔊 Another case of data privacy violation

“I was using an app to see how many miles I rode my bike and now it was putting me at the scene of the crime,” said Zachary McCoy. Google’s legal investigations support team emailed him to let him know that local police had demanded information related to his Google account. McCoy’s lawyer “pointed to an Arizona case in which a man was mistakenly arrested and jailed for murder largely based on Google data received from a geofence warrant. McCoy said he may have ended up in a similar spot if his parents hadn’t given him several thousand dollars to hire Kenyon.”

The article also notes a Google filing last year reporting that the requests from state and federal law enforcement authorities increased by more than 1,500 percent from 2017 to 2018, and then again by 500 percent from 2018 to 2019.



Ok, this is not exactly space related news, but it ties up into a larger scope of what I care about and what I want you to pay attention to. You are encouraged to read the full story from the link above. And consider this your monthly reminder to check your digital privacy.

📹 🔊 Another small satellite launcher



The California-based spaceflight startup Astra scrubbed a planned orbital launch attempt from the Pacific Spaceport Complex on Alaska’s Kodiak Island on Monday (March 2).

The mission’s guidance, navigation and control officer noticed some potentially problematic data less than a minute before liftoff Monday,

Three of them — Astra, Virgin Orbit and Vector Launch — advanced to become “full participants.” But Virgin Orbit and Vector Launch eventually dropped out, leaving Astra as the sole competitor.

Before this news came along, I actually did not know that DARPA had an ongoing competition to launch small satellites into orbit. Last month, I told you guys about Spin Launch. A company which recently secured $80 million in terms of seed money. 

SpaceX is doing an excellent job to bring down the cost of each launch. But SpaceX is targeting heavier satellites. SpaceX can still launch small satellites, it is just you need to find a partner to fill up the other seats. Otherwise you have to pay for the entire launch. If we have smaller rockets, (like Electron, from RocketLabs) you can pay less, launch more frequently. It is a race against a time.

📹 🔊 SpaceX raises over $500 million by selling shares


Spin Launch isn’t the only company looking for raising money. SpaceX sold $500 million worth of shares. Not enough details are available. But I SPECULATE, this money will go into ‘Starship’ R&D. Each share was worth $220. 

📹 🔊 Satellite Boom to ‘Wreak Havoc’ on Astrophotography, NASA


Satellite Boom to ‘Wreak Havoc’ on Astrophotography, NASA Says



This is a topic I personally care about. We are experiencing a growth in the satellite industry. Business analyst companies are forecasting this growth to sustain for a while. A portion of the new satellites to be launched in the coming years, will be launched into Low Earth Orbit (LEO). This is an orbit where data latency is lower although the atmospheric drag is higher. There is a topic that goes unnoticed by many. Debris problem. When you have so many satellites orbiting the earth, how to control the debris problem. Over the years, people have started paying attention. We now need the same kind of attention to a different kind of pollution. Light pollution created by these satellites in LEO.lit

It kind of sounds funny coming from me. I was born and raised in Bangladesh. Light pollution is least of our worries. As a matter of fact, thousands of people still don’t have access to electricity, hence no light at night. We have water pollution, air is unbreathable. So, on a greater scale of things, it is not as important.

I love staring into the night sky. In 2008, I went to St. Martin Island with my college buddies. The island is disconnected with the mainland and too small to have a power plant. As a result, at night, we would have no power. Diesel generators would run for 1 hour. That’s all you’d get. Being a city kid it was disappointing at first. But once I stepped outside I experienced something I would never forget. The island was far away from the mainland. So you couldn’t see any lights coming from the city. Since the generators were not running, no bright light source on the island. When you stand on the beach and look up at the sky, the sight is unforgettable. That was my first glimpse into the Galaxy. Since that time, I’ve been longing for a similar experience. But within the city boundaries, it is impossible. Let’s say, in the future, I save up enough money for a similar trip. I save up money and go to a distant remote island. Question is, will I have the same experience? Probably not. We already know starlink is creating headaches for astronomers and more satellites are on the way. From the FCC they have permission to put 30,000 more of these satellites. Sure, recent black coatings are an improvement in the reflectivity of these satellites, but it will never be enough.Image from: https://petapixel.com/assets/uploads/2020/03/satellitenigyhtskyfeat-800x800.jpg

This makes me sad.

📹 🔊 20ms latency


Elon Musk: Starlink Latency Will Be Good Enough For Competitive Gaming

Every month I compile space news, there are so many news related to SpaceX, I might need a section dedicated to SpaceX news. 

This one is from SpaceX starlink project. Since the beginning of the Starlink project announcement, I had one question, “How will this business model work?” Because building and launching satellites is very very expensive. There is no guarantee that it’ll pay off. The Iridium constellation had similar goals. To bring everybody under cell phone coverage. It didn’t work for them. SpaceX wants to bring everybody under internet coverage. Will it be any different for them? There was a similar philosophical project before. I forgot the name of the project. Much earlier to the announcement of the starlink project, a small group was working on a small satellite that could provide internet to the disconnected part of the world. There was no constellation. So the service could never be in real time. The concept was, the satellite would come with a ground terminal. Ground terminal would act as a server. It’d have some wikipedia pages pre-loaded. Once the user requests a page which was not in the server’s memory, the server would then send a request to the satellite. In the subsequent passes, the satellite would send back the requested pages. It would consume a lot of time, but at least, people would have very rudimentary access to the internet. (If someone remembers the project name, please let me know in the comments). 

What SpaceX is trying to do is very expensive. Normally, you would need a tracking device to point your antenna. If the tracking device fails, you will never upload or download anything from the satellite. Starlink service requires no pointing mechanism. That means, no matter where you are pointing, a starlink satellite would always be there. That is a lot of satellites. A lot of investment. What if there was no customer to pay for such expensive service. As I’m wondering, Amazon CEO Jeff Bezos announced, his company is working on the same thing, OneWeb. A web connectivity solution via satellites. These people clearly have done their research and they have means to survey the market. If both of them are racing towards global satellite connection, I’m starting to think there is a lot of money to be made. Whether or not anyone is right, only time will tell.

In his latest statement, Elon Musk has said, the satellite link will have a 20ms latency. This is a bold statement to make. Even many optical broadband lines cannot manage 20ms latency time due to various routing mechanisms and internet traffic. If Starlink satellite is truly such a low latency network, then surely, a lot of people will start to line up for the service.

I would like to remind my readers at this point that latency is not the same as bandwidth. Let’s say you have very very high bandwidth and a very very high latency. You decide to watch a movie in 4K. You open up your netflix and hit play. Because you have very very high latency, it will take some time to load the movie. But at the same time, since you have very very high bandwidth, your video will not buffer. If you are gaming on this imaginary system, you’ll see the difference much clearly. Your video quality would be great, but each click or each move you make in the video game takes a while to register. The game would lag behind.

If you had the opposite system, verry very low latency and very very low bandwidth, your videos would load up very fast, but you’ll never be able to watch youtube in 4k. Your video game performance would improve, but the video quality will be rubbish.  

🔊 Lockhead martin app


You can actually get a job as an ‘Orbit Designer’. In this job you decide how many satellites your company needs to make to execute their plan. Or When you need to launch your satellite so it can reach Mars using the least amount of fuel. You come up with different solutions for different input. Of course, we now have computer tools to aid us in such a decision making process. But these software are very high tech and developed in house in space agency. 

Lockhead Martin has ported and simplified these software to run from an iPad. A fucking iPad. It only means one thing, lockhead Martin is aiming to build satellite constellations for multiple clients. The work is so repeatative for them, the came up with a fucking app. What’s next? A door to door salesman selling satellite constellations???

Now some of these softwares are available in public domain (orbitron for example). These softwares are not as interesting as your iPad apps but they work. Many apps are making their way into smartphones to raise public awareness. You can download most of them for free. In the meantime, I recommend checking www.stuffin.space to get a picture of how many satellites are currently in space. Alternatively, you can check out Celestrak.com, the website I use the most for satellite tracking. 

📹 🔊 SpaceX – Starlink

Source 1:

Falcon 9 Rocket Overcomes Engine Failure To Deploy 60 Starlink Satellites

Source 2: 

Source 3: 

One of the rocket’s nine first stage engines shut down prematurely around 2 minutes, 22 seconds

The first stage missed a landing attempt on SpaceX’s drone ship parked in the Atlantic Ocean northeast of Cape Canaveral, the second time SpaceX has missed a rocket landing in the company’s last three missions.

The sixth batch of starlink satellites is up in orbit. There was a slight glitch during the launch. One of the nine first stage booster rocket engines prematurely shutdown 2 minutes 22 seconds into the launch. The mission itself remained unaffected, thanks to other 8 engines that were working just fine. The anomaly could be (we are all speculating here) due the fact that this first stage had already been used in the past. 4 times already. So it is not so surprising that on its 5th trip to space, something was not perfect. The booster rockets could not make it back to the drone ship. This is probably due to burning up extra fuel & ground operators uploading the wrong wind data. Anyway, no biggie. I’m happy to see SpaceX is pushing their boosters to the limit and learning more about them. Not so happy about the new shinny(!) starlink satellites.