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The end of the mystery! Explanation of the change in brightness of the star Betelgeuse

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The end of the mystery!  Explanation of the change in brightness of the star Betelgeuse

The mystery of the tarnishing of the star Betelgeuse seems to have officially come to an end. The red supergiant, one of the brightest stars in the night sky and part of the constellation Orion, caught the attention of astronomers around the world in 2019 and was expected to a supernova is about to explode… This was not the case, and now we know what really happened: it was covered in dust created by the star itself.

At that time, some there were hypotheses about the brightness of BetelgeuseSome look at the cooling of the star’s surface, while others look at the giant cloud of gas and dust it has thrown in our direction. In fact, this possible ejection of matter is common for red giants, even long before they are about to explode. However, according to new research, both ideas – cooling and dust – turned out to be correct.

The above animation combines four images of a red supergiant star – the first taken in January 2019, another in December of the same year, and then in January 2020 and March 2020. All images were captured with the SPHERE instrument on the Very Large Telescope. The study was published Wednesday (16) in the journal Nature and shows how the dust cover formed and covered the star.

On the surface of Betelgeuse, some gas bubbles tend to form and move, contract and enlarge, resulting in a change in the star’s temperature. At some point, before the mysterious change in brightness, the star ejected a huge bubble of gas, which retired and then cooled due to the drop in temperature at the star’s surface. This was enough for the ejected gas to condense into solid dust.

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Thus, a cloud of dust covered part of the star, which to us looked like a strange decrease in brightness. “We are directly observing the formation of what is called stardust,” said Montarge, one of the study’s authors. “Dust ejected from cold formed stars, such as the ejection we saw, could be the building blocks of terrestrial planets and life,” adds Emily Cannon, who also participated in the study.

Taken in January 2019, the star is showing normal brightness, while the rest of the images were taken as the star’s brightness decreased (Image: Reproduction / ESO / M. Montargès)

This result may not be as exciting as an impending supernova, but it gives scientists relevant information about stardust, and also shows that it is forming very quickly and close to the surface of the star. Betelgeuse will explode sooner or later, but it can take many years for this to happen… Of course, it’s always good to be on the alert, but if we want to witness a supernova it might be better. pay more attention to Eta Carinae, a binary system that is already in the process of erupting.

A source: WHAT

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Blocks R21

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Blocks R21

Portuguese 3D printer startup Blocks will release a new model, the Blocks R21, which is due to hit the market in September. Fortunately, we were able to test the device already in its final version, which showed an impressive evolution compared to the previously tested model. One MKII.

This new printer features an all-aluminum construction, an LCD touch panel that allows you to control all printer settings. Among them is the calibration of the print tray, which, in addition to heating, has a metal coating with a texture that greatly contributes to the adhesion of the filament during printing.

Another important detail is the integration of all the main printing elements in one module, such as a two-block extruder and a hot end. The latter has a threaded screw for quick replacement, which allows you to replace the module with another one with a nozzle that is compatible with a particular type of filament. The variation can be from 0.2 to 1 mm – the hot end supplied with the printer is equipped with a 0.4 mm nozzle. This is to provide better print quality based on filament type, from traditional PLA to ABS, Flex, PETG, nylon, fiberglass, carbon fiber reinforced PET, PLA with metal or wood.

In terms of use, the Blocks R21 couldn’t be simpler and more intuitive thanks to the aforementioned LCD touch screen and a new tray that is easy to calibrate and requires a minimum amount of glue liquid (varnish). The fact that it uses an almost closed rigid construction, together with the integration of all units into a single module, made it feel quieter: it was even the quietest I have tested to date. Blocks R21 is priced to be considered “premium” and is available in a basic version, already with all the accessories you need to get started printing right away. However, we can buy it with an optional connection kit which, while pushing the price up to a less than pleasant €1,800, adds a Wi-Fi controller, webcam and temperature sensor so you can monitor print status remotely.

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Distributor: Blocks

Price: €1575


Data sheet

Print area: 210 x 300 x 250 mm
print speed: 60 mm/s
Connections: USB, SD card, WiFi
Compatibility: Windows, MacOS, Linux
Additionally: power cord, USB cable, USB stick, spatula, tweezers, calibration paper, adhesive spray,
Dimensions: 470 x 350 x 490 mm
Weight: 18 kg


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Learn about the extended RAM feature coming to mobile phones and tablets | Cell

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Learn about the extended RAM feature coming to mobile phones and tablets |  Cell

Virtual RAM, also known as RAM Plus – is a memory expansion feature that is increasingly used in cell phones from major manufacturers. brands like Samsung e xiaomi to make the feature available on some smartphones, such as Galaxy devices in the case of the South Korean one, and some models of the POCO, Redmi and Mi series, on the Chinese side. The function uses the free part of the cell’s memory to expand the RAM and thus improve the performance of the device. OUR Apple also recently announced such a feature for ipad.

The iPhone manufacturer revealed the functionality during the presentation of new items iPadOS 16 at the beginning of June. The operating system update will bring for those devices that are equipped with M1 or M2 processors, the replacement of virtual memory. According to Apple, the update will use ipad offer up to 16GB of storage to help run the heaviest apps like phones do android.

Samsung Galaxy A53 — Photo: Disclosure/Samsung

How virtual memory works

Virtual RAM is not native to devices and became available after a software update. That is, everything will depend on how up-to-date the user’s operating system is, and even so, this is a feature that is far from being released to everyone. The available size depends on the smartphone. when Samsungfor example, Galaxy A52S can be used additionally up to 4 GB, but Galaxy A53 you can use up to 8GB more via RAM Plus.

when Applewhich provides additional memory for iPad models only ipad 11″ Pro (3rd generation), ipad 12.9″ Pro (5th gen) and ipad Air 5th generation, equipped with the giant’s own processors, will be able to use this feature. OUR xiaomi more democratic, with more than 30 compatible devices, including Xiaomi Mi 11, Redmi Note 10 Pro 5G, Poco F3 and others.

Apple’s iPadOS 16 combines multiple overlapping windows into a single view – Photo: Handout/Apple

Benefits of using virtual RAM

Among the benefits of enabling virtual RAM is the ability to run multiple applications at the same time without crashing, as the system allocates storage according to the needs of the device – but, of course, within the limit set by the manufacturer. Heavier applications that require more from smartphones can be downloaded and used without delay.

RAM Plus can be accessed in the Samsung Android memory settings – Photo: Reproduction/Katarina Bandeira

Disadvantages of using virtual RAM

Despite the performance benefits, there are some limitations that the user must be aware of before enabling a significant amount of virtual RAM. First, even with the addition of RAM, the performance is not the same as the physical version. It is also not possible to disable this feature on devices that support this feature.

That is, if your phone has 128 GB of internal storage, at least 2 GB will be dedicated to the device’s virtual RAM, which will reduce the space to 126 GB. Also, using this feature to use a heavier application may result in performance degradation of other applications running in the background.

It is important to note that in order to use this function, the mobile phone must have free internal memory, that is, it cannot be occupied by files of any nature or systems. Otherwise, the function cannot be activated. on the site Samsung, the manufacturer itself warns of the limitation “RAM Plus is a technology that uses part of the smartphone’s internal memory as RAM. You must have free space on the internal memory, ”is written in small print on the manufacturer’s website.

Launch of Xiaomi, Mi 11 has sold over 1 million units. — Photo: Publicity/Xiaomi

How to find out the amount of virtual memory on your mobile

for instruments xiaomi, the path is almost the same: Settings > Advanced settings > Memory expansion and enable the function. On devices from both manufacturers, you must restart the cell phone after activating or selecting the amount of virtual RAM to use. When iPadOSYes Appledespite what has been announced, this feature will only be available when the new operating system becomes available for new devices, which should happen in the second half of the year.

with information from Samsung e Apple

Which one is better xiaomi? Take a look at the 3 most powerful cell phones in the video below.

What is better than Xiaomi? Meet the 3 most powerful mobile phones of 2022

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Wi-Fi hotspot crashes fixed, and there’s a new study

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Windows 11 atualização KB5014668 pesquisa WiFi

Windows Updates can be a real mess, but in some situations, they can fix a lot of problems. We’ve seen this happen in the past, and it looks like it’s happening again.

This week, a new system update from Microsoft was released that fixes a number of issues with Windows 11. This is an optional update, but it is recommended for anyone who has problems with this system.


Patch Tuesday in June was not positive for Windows 11. In addition to the security fixes and general improvements it introduced, it also brought several issues to users of this system.

One of the biggest complaints was related to Wi-Fi and loss of connection when activating a hotspot in Windows 11. It was a strange situation, but Microsoft quickly investigated it to find a solution.

Windows 11 Update KB5014668 Search Wi-Fi

Is arrive now in an optional update available to everyone. Marked as KB5014668, it will put Windows 11 on build 22000.778 and will permanently fix this hotspot issue and its loss of connection.

In addition to addressing this issue, Microsoft has added another new feature in KB5014668. This one focuses on research and brings what Microsoft has labeled as Highlights, which are dedicated to special days or holidays, with images hinting at those moments.

Windows 11 Update KB5014668 Search Wi-Fi

Of course, KB5014668 also solved other Windows 11 issues that caused the system to work incorrectly. Here, we've had video playback crashes, Bluetooth device pairing issues at startup, and even Microsoft's own system update.

Anyone who wants to install this new Windows 11 update must go to Settings and then find the news on Windows Update. KB5014668 is optional and will only be displayed this way, so you need to follow these steps. If you have problems with Windows 11, the best thing to do is to install this system update from Microsoft.

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