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Showing posts from November, 2020

Watch an Arianespace Soyuz Rocket lift off as Arianespace Flight VS24.

On November 30th, an Arianespace Soyuz Rocket will launch into a Sun-synchronous orbit from Spaceport, French Guiana (Guiana Space Center). The launch vehicle is Soyuz, and the launch date is December 1st, 2020. This mission is called Arianespace Flight VS24, or Arianespace Soyuz Flight VS24. FalconEye is a high-performance optical Earth observation satellite system for the Armed Forces of the United Arab Emirates (UAE AF) manufactured by the consortium of Airbus Defence and Space and Thales Alenia Space. No rocket boosters will be recovered in this flight of Soyuz, but we can look forward to seeing this possibly in the future. Official Broadcast/Livestream: Currently unknown, as the mission was scrubbed for the 29th, and the 30th, but you will see the Livestream thumbnail here, as the first video: https://www.youtube.com/c/arianespace/videos

Do numbers really exist? No, really.

How do spacecraft survive atmospheric re-entry?

Every crewed spacecraft has a heat shield of some sort. When you enter an objects atmosphere, and it is thick enough to produce a good amount of heat during entry or re-entry, like Earth, Venus, Mars, and more, you are going to need some sort of heat shield. There are 2 main types of heat shields (these are the most common ones), ablative heat shields and heat shields that absorb and contain heat. Most spacecraft, including the ones that took people to the moon and back, in 1969-1972, used ablative heat shields. An ablative heat shield consists of a type of material, when exposed to extreme heat temperatures, turns into a gas and carries the heat away. Obviously, these cannot be reused easily because a good fraction of the material would have ablated away due to re-entry. Since The Sun has energy and releases a ton of it every second, the heat shield would be exposed to energy emitted from the sun. This is why they often spray a protective coat on the heat shield that can reflect as mu

How cache can speed up your website.

We all are annoyed when we visit a website, then for some reason, we have to clear our cookies or cache in our browser. We are NOT talking about real cookies, like the edible ones, we are talking about browser cookies. Cache is stored in your browser for a reason, instead of loading all of the data from a website, directly from the web server, it loads it quickly on your browser client, with the stored data being called "cache". This is faster because it does not have to fetch the extra data from the web server, causing a slower load time and an overall slower website experience. Cache basically speeds up your connection to websites. Cache is very beneficial, if your website is down, and you need it up for your clients and visitors to view while you work the problem to get it back online, what you can do next time is, have the web server create cache for your website content, so next time your website is down, instead of your server loading the data from the actual source cod

What does "random" mean?

Random, is a pretty common word, but is often used incorrectly. Random, is an outcome that is unpredictable with no pattern that can be seen. Programming languages have random variables for generating things like passwords, usernames, and more. There are some things that are not random, but can be called random, like "I randomly decided to walk down that street". That isn't random, because you chose to do it, with your control over it. To others it can be called random, because it might be unpredictable to other people. Some things that are called random are mistaken for a coincidence, like if I am shopping in a store and I run into my friends friend. That wasn't really random, it was a coincidence. If you roll a dice, it's pretty unpredictable on what it will land on, unless you have a machine that calculates its velocity and slowing rate, and movements, that can calculate the result. Then, the dice roll will not be random. If I am thinking of the letter pattern,

Can humans colonize Mars?

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Yes, humans can colonize Mars, but there are some issues that we would need to get around. Let's say you launch a rocket into earth-orbit, then from there, fired your engines to put yourself on a trajectory to rendezvous with Mars sometime within the next few months. Sure, you can arrive at Mars, and land, as long as you have a heat shield to survive atmospheric entry and engines that you can start up to touch down safely, but you need a way to get back to Earth, and you also need a way to communicate with Earth. Mars orbits farther away from the Sun than Earth does, so the 2 planets' orbits are not in sync. Mars orbits slower than Earth, so at one point, Mars and Earth will be exactly horizontal from each other, like this image below. The sun is now in between Earth and Mars, so you don't really have a way to communicate. This means, if there is a leak in your station on Mars, well, you can't tell anyone about it besides your Martian friends. You can fix this with a de

What was a day in Ancient Egypt like? What technology did they have?

Back in Ancient Egypt, they didn't have any computers, including smartphones, obviously. Their "technology" was ropes and wooden platforms. To move big things from place to place, they didn't use a truck, they used a giant wooden platform with hundreds of people pulling it, using all of their force, to barely move a giant object. There was no electricity and no motorized things like cranes. This shows you how far we have come since Ancient Egypt, and how many things we have invented since. In Ancient Egypt, they made their way around via donkeys moving a wagon, and not Tesla's.

What is a computer?

When we think of computers, we think of desktops. When we think of smartphones, well, we think of smartphones. Computers aren't just desktops, they are smartphones, tablets, Arduino's, Xbox's, PlayStations, and more. They are computers, because they can compute things. They all have the ability to process binary code, store data, read and write files, and more. Rockets contain computers, boats contain computers, cars contain computers, and even keyboards contain a form of a computer. You are probably reading this from a computer right now, unless you printed this out. When a computer is running, it is computing data every second, from the CPU, GPU, Hard Drive, and more. You simply cant get around this, and if you try to, it wont be a computer anymore, it will be a useless piece of metal. So, as long as you don't break any of your computer hardware, you will still have a computer!

Why is battery life so different on different devices?

Some of us have terrible battery life on our laptops or smartphones, but some of us also have amazing battery life! There is a simple reason behind this. Different devices have different specifications, let's say you have 2 laptops, Laptop #1 has a weak Intel Celeron CPU with no GPU, and Laptop #2 has a very fast Intel Core i9 CPU with an NVIDIA 1050 TI GPU. Laptop #1's battery will last longer, because it doesn't have a GPU taking power from the battery, and the CPU takes less power from the battery because it is a weaker CPU that isn't as powerful as Laptop #2's CPU. Laptop #2 will die faster because it has a GPU which takes a lot of power from the battery to process graphics and a really good CPU that is much more powerful than Laptop #1's CPU, meaning that it will use a lot more power. The same goes for different types of electronics, like rockets, cars, and more. If an electric car is heavier, it needs to use more power to physically move, leading to your b

Arca Space is testing a new water-fueled rocket, but is it efficient?

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We all know that rockets are powerful, complicated, huge, and sometimes not good for the environment. The Space Shuttle had those 2 giant boosters, and they polluted way more than you would think. A lot of rockets like the Russian Soyuz Rocket, the ULA Atlas V Rocket, and even the SpaceX Falcon 9 and Falcon Heavy Rocket, use toxic Kerosene as fuel and could release as much pollution as 700,000 gasoline-powered cars running at the same time. Some rockets pollute less, and some pollute more. This company, Arca Space, is creating a futuristic new rocket concept, powered not by your average fuel, it's powered by water. No, not LH2 and LOX, WATER! It has a water tank that is used as fuel. The water gets heated up to about 500 degrees F in a high-pressure tank, which is then shot into the also high-pressure combustion chamber and shot out of the nozzle as mostly steam. This rocket can only produce about 7 tons of force at the moment, but this will improve as time goes by. Rocket Lab'

What are Hypergolic fuels?

How can I keep something in space once in space?

Let's say you just launched something into space, with your amazing space launch system, wait, that's NASA's new rocket, SLS, if you didn't understand that joke then you clearly aren't educated about NASA. That was a joke too, by the way. Now, your payload that you sent on your launch vehicle is in space, coasting upwards, but then it starts falling back down after it reaches its apogee, aka highest point away from earth. This is due to Earth's gravity pulling the object back towards it. To stay in space, you will need to achieve orbital velocity, which is the speed requited to get in orbit. For Earth, which is probably where you are, the orbital velocity is around 7,500 miles per hour, or around 3,355 meters per second. To achieve orbital velocity, it requires a lot of energy, this can be achieved with either solid or liquid fuel, either one works, and usually requires multiple stages on a rocket. When you are not in orbit, but in space, you are either not orb

Heres why a smartphone could be generally better than a laptop.

Most of us have smartphones, and we really like them, well, at least if they aren't a few years old. A lot of us also have laptops, and they are very useful. At the moment, most laptops are more powerful than smartphones, but smartphones are more simple and portable, specifically Android phones. You can do more things on Laptops, due to the huge popularity of the Windows OS. Desktop Apps for Windows, Mac, and more are getting old, its better to have a product all online rather than having to download a program or installation file. Android apps, aren't really getting old, they are actually WAY more popular than desktop apps, mostly because of the Google Play Store. Smartphones are less complicated than laptops are require less thinking and skill to perform certain actions. They are way easier to take care of. If you want to call someone, you simply just take your phone, put in your PIN code or password or fingerprint, then simply tell your assistant whether it is Google, Bixby,

What is the fastest way to get somewhere on Earth?

For those of you who don't know, the earth is a planet that most of us currently live on, it is not flat, there are people orbiting it right now, and its shape is a bulging sphere. Sometimes, we need to get somewhere far away from where we live on Earth, and it takes a long time, even if it is on an airplane, it can still take somewhere around 12 hours. Commercial Boats/Cruises are getting old, and they aren't very fast and could be dangerous. Airplanes are pretty reliable at the moment, and they are one of the cheapest ways to get somewhere "fast" that is far away, and they have been around for quite some time. Trains cannot be used to get somewhere very very very far, but they can be used to travel a decent distance substantially fast. New methods of transportation are coming, and they are coming fast. A new transportation system called Hyperloop consists of a Low-Pressure air tube with a pod inside which can travel EXTREMELY fast, with a cruising speed of about 340