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New map of space includes nearly 400,000 nearby galaxies Science



New map of space includes nearly 400,000 nearby galaxies Science

Astronomers have long sought to map the night sky, not only to complement our understanding of the universe we live in, but also to support further research.

However, these scientific sources must be periodically updated to reflect technological improvements in telescopes, and in this context, astronomers have created a comprehensive atlas of nearly 400,000 galaxies in our cosmic neighborhood.

The atlas, called the “Siena Atlas of Galaxies,” was compiled using data from the US National Science Foundation’s Noirlab telescopes and is designed to be a digital galaxy atlas dedicated to large galaxies. Galaxy formation and evolution into dark matter and gravitational waves. It is also freely available online for the public to explore. The atlas was presented in a paper appearing in the subseries of The Astrophysical Journal.

3 Summary of studies

The Siena Atlas of the Galaxy is a compilation of data from 3 surveys completed between 2014 and 2017 to identify galactic targets. Data were collected at Cerro Tololo Inter-American Laboratory and Kitt Peak National Laboratory. “NOERLAB” projects, and at the Stewart Laboratory at the University of Arizona.

The surveys used state-of-the-art instruments on telescopes operated by Neurolab, and the survey data, as well as a searchable version of the full Siena Galaxy Atlas, were made available to the astronomical community via the Astra Data Lab science platform. Astronomy Data Archive at the Social Science and Data Center affiliated with Noirlab.

The Siena Atlas of Galaxies contains additional data from a study by NASA’s Wide Field Infrared Survey Explorer satellite, reprocessed by Neuerlaub astronomer Aaron Meissner.

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The probes took images at optical and infrared wavelengths and mapped a total of 20,000 square degrees, half of the night sky, making it one of the largest galaxy surveys ever.

By bringing this wealth of information into one place, the Siena Atlas of the Galaxy provides precise data on the positions, shapes and sizes of hundreds of thousands of large, relatively nearby galaxies. Besides, the data in the atlas reaches a new level of precision.

Optical mosaics of 42 galaxies are included in the Siena Atlas of Galaxies (NOERLAB – National Science Foundation).

An atlas for researchers and the general public

The Siena Atlas of the Galaxy builds on a centuries-long effort to chart the night sky. The famous catalog of nebulae and star clusters published by the French astronomer Charles Messier in 1774 was a milestone, as was the new general catalog of nebulae and star clusters published by John Louis-Emilie Dreyer in 1888.

In 1991, astronomers compiled the Third Bright Catalog of Galaxies. Several valuable galaxy atlases have been published over the past two decades, but most are based on photographic plate measurements of the third brightest catalog of galaxies or are missing large numbers. Galaxies.. Since the Siena Atlas of Galaxies uses digital images taken with highly sensitive instruments, it represents a significant improvement in data quality and completeness.

Previous constellations suffered from inaccurate locations, sizes, and shapes of galaxies, and contained information about objects other than galaxies, such as stars. Galaxy’s Siena Atlas goes beyond all of these.

This versatile resource is driving progress in many branches of astronomy and astrophysics, helping researchers find better galaxy models. However, it is important to note that the atlas is not just for academic researchers; It is available to watch online for free for anyone who wants to get to know our corner of the universe better.

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BREAKING: Redmi Note 13 Phone Launched in Saudi Arabia and Egypt Find out about the price and specifications



BREAKING: Redmi Note 13 Phone Launched in Saudi Arabia and Egypt  Find out about the price and specifications

Recently, the launch of Xiaomi Redmi Note 13 phone was announced in Egypt and Saudi Arabia, which made many users and mobile phone lovers search for the specifications of this phone and what is the right price because this phone comes with some great qualities. Ease of use in keeping with the times, it is worth noting that the Redmi Note 13 also has features that make it a best seller in the markets, so we will show you everything related to the phone in terms of advantages, disadvantages, and prices in the Egyptian and Saudi markets, all through the following article.

Xiaomi Redmi Note 13 phone

Due to the high number of inquiries about the Redmi Note 13 phone, the search for its specifications has increased, which include:

  • This phone comes from the latest category of mobile and smart phones and is associated with Xiaomi.
  • The phone is slated to launch by September 2023.
  • The phone is available in several unique colors including white, black and blue.
  • The length of the phone is about 161 mm, width is 75 mm, thickness of the phone is about 7.5 mm and weight is 173 grams.
  • The extra large 6.6-inch screen is perfect for gaming and video playback.
  • The refresh rate of the screen is 120 Hz, 365 pixels per inch.
  • The brightness reaches 1000 nits, which is the highest brightness you can see.

read more: When is the Samsung Galaxy S24 Ultra release date in Saudi Arabia, what are the specifications and prices of the phone?

Redmi Note 13 Phone Specifications

Xiaomi Redmi Note 13 phone

As for the specifications of the Redmi Note 13 phone, it is considered to be the best features including:

  • The octa-core Mediatek processor has a manufacturing precision of up to 6 nm.
  • The processor frequency is around 2.4 GHz.
  • The phone has different types of RAM, 6, 8, 12, GB RAM.
  • There are two types of internal phone memory: 128 GB and others 256 GB.
  • Another feature of the phone is the camera, which isolates the background while shooting.
  • The possibilities for shooting at night are amazing.
  • This includes AI photography and geotagging and digital zoom.

read more: Ways to remove the smell of fries at home without using perfumes.

Redmi Note 13 Phone Price

After the launch of the Redmi Note 13 phone in the Saudi and Egyptian markets, everyone wants to know the exact prices, which are as follows:

  • Redmi Note 13, 128 GB version, priced at $190.
  • The phone comes in Egypt at a price of 5,900 thousand Egyptian pounds.
  • We have the 256 version with 8 GB of RAM priced at 6,300 Egyptian pounds, and in foreign markets the price is around 205 USD.
  • The highest version costs around 7,100 Egyptian pounds.

How much does Xiaomi 13 Ultra cost in Egypt?

The price of Xiaomi 13 Ultra phone in Egypt is about 27 thousand Egyptian pounds, and it has 256 GB and 12 GB RAM.

how much Redmi Note 13 Pro

The price of the Redmi Note 13 Pro phone is around 19,500 thousand Egyptian pounds.

How much does Xiaomi 12 Ultra cost?

Xiaomi 12 Ultra phone, 512 GB version, comes with 12 GB RAM for 35 thousand pounds.

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Once in 21 thousand years the desert turns into fertile land! | Arab weather



Once in 21 thousand years the desert turns into fertile land!  |  Arab weather

Arabia Weather – It’s hard to imagine, but the Sahara desert was a green forest a few thousand years ago.

Every 21,000 years the desert becomes fertile land

The sand dunes and rocky plateaus of the Sahara may seem as old as time, but that may be far from the truth. According to a new study, this vast area of ​​North Africa changes from barren desert to lush forest every 21,000 years or so.

The last time the Sahara was a green forest occurred between 15,000 and 5,000 years ago. This latest research confirms that it’s not just a curious blip, but part of a cycle that changes an area from dry to wet every 21,000 years.

Dr Edward Armstrong, lead author of the study and a climate scientist from the University of Helsinki and the University of Bristol, said in a statement: “The transformation of the Sahara into different ecosystems and forests is one of the most significant environmental changes on the planet.”

“Our study is one of the first climate modeling studies that simulates African wet periods at a scale similar to what paleoclimate observations indicate, and reveals why and when these events occur.”

The new research seems to have a better understanding of what is being called “Wet Periods in North Africa”. It uses a recently developed climate model for the past 800,000 years.

Their work confirmed the idea that periodic wet phases in the Sahara are driven by changes in Earth’s orbit around the Sun. It is generally agreed that “Greening“The Sahara desert exists because of the Earth’s tilt on its axis, which affects the seasons and determines the amount of energy a part of the planet receives. This ultimately affects the strength of the African monsoon, which helps control the amount of vegetation spread across a wide area.

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However, their work also suggests that this circulation may be influenced by distant ice sheets at high latitudes in the Northern Hemisphere. Wet periods did not occur during the Ice Ages, when most of Earth’s high latitudes were covered by thick ice sheets.

Experts speculate that these ice sheets served to cool the atmosphere like a refrigerator, controlling the African monsoon system and suppressing the growth of plant life in the Sahara.

Cycle change in North Africa is not only a big problem for the Sahara, but it has huge implications for our story. After all, humanity’s greatest early achievements—the migrations out of Africa—were largely dictated by conditions in the Sahara. Depending on his “mood”, it can act as a severe barrier or a welcoming path.

The door was open when the desert was green and closed when deserts prevailed

Mika Thalavara, co-author and assistant professor of hominin ecology at the University of Helsinki, explained: “The Sahara serves as a gateway to northern and sub-Saharan Africa, controlling the spread of species within and beyond the continent.”

The door was open when the desert was green and closed when deserts prevailed. This transition between wet and dry phases had serious consequences for the distribution and evolution of species in Africa. Modeling wet periods in North Africa is a major achievement, and we are now able to model human distributions and understand the evolution of our species in Africa.

Source: Science


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Find out the specifications of the Honor X7b phone



Find out the specifications of the Honor X7b phone

Find out the specifications of the Honor X7b phone

Find out the specifications of the Honor X7b phone

Honor recently launched the Honor X7b phone with a larger battery capacity, 108-megapixel main camera and starting at $249.


The phone supports the Snapdragon 680 processor chip, so the phone is limited to connectivity to 4G networks. The phone is available with random memory options of 6 or 8 GB RAM and 128 or 256 GB storage capacity, and supports external. Storage on microSD.

On the rear camera setup, Honor

The battery is one of the most important marketing points of this version, as it includes a 6000 mAh battery, and supports 35W fast charging technology via the Honor Supercharge charger.


800 thousand Palestinians in Gaza and Northern Gaza Strip without food or medicine ←

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