Milky

• Qixi is a very Chinese festival, so I want to make it classic but at the same time, creative," Xiao noted.
• As the only traditional Chinese festival dedicated to romance, the Qixi Festival honors faith, devotion and unwavering true love.
• Besides spending the romantic night together, an increasing number of young people are participating in activities featuring the traditional essence.
• In China's capital city, more than 30 Qixi activities will be held by local parks and museums to welcome the traditional festival, according to media reports.

• For the first time, the IceCube Neutrino Observatory in Antarctica has produced an image of the Milky Way using neutrinos – tiny, ghost-like astronomical messengers.
• We have not yet figured out exactly where in our galaxy these particles are coming from.

Neutrino astronomy

• This makes them very interesting to astronomers, because neutrinos offer a window into the extreme cosmic environments that create another kind of particle called cosmic rays.
• Cosmic rays are high-energy particles that permeate our Universe, but their origins are difficult to pin down.
• So if we can detect the path of neutrinos arriving at Earth, this will point back to where the neutrinos were created.

How to hunt neutrinos

• It uses more than 5,000 light sensors arrayed throughout a cubic kilometre of pristine Antarctic ice to search for signs of high-energy neutrinos from our galaxy and beyond.
• Vast numbers of neutrinos are streaming through Earth all the time, but only a tiny fraction of them bump into anything on their way through.
• This is because some flashes IceCube detected can be traced to cosmic rays hitting Earth’s atmosphere, which create neutrinos and other particles called muons.

Closing in on cosmic rays

• The new neutrino lens on our galaxy will help reveal where the most powerful accelerators of galactic cosmic rays are located.
• We hope to learn how energetic these particles can get, and the inner workings of these high-energy galactic engines.
• They plan to estimate the flux of neutrinos produced by cosmic rays interacting in the clouds, after the neutrinos travel from the accelerators.

• These outlandish comparisons are the invention of Jerusalem Post journalist Aaron Reich (who bills himself as “creator of the giraffe metric”), but real astronomers sometimes measure celestial objects with units that are just as strange.
• The idea of a planet that’s 85% the mass of Earth seems straightforward.

Why do astronomers use such strange units?

• Earth’s radius is about 638 million cm, or 7.5 million Astros.
• That number of Astros is a bit ridiculous, which is why we adjust our unit choice to one that makes more sense.
• At an even larger scale, consider the star Betelguese: its radius is 83,000 Earths, or 764 times the radius of the Sun.

Heavy stuff

• If we want to measure how heavy an asteroid is, we could do it with camels – but in space we’re more interested in mass than in weight.
• Mass is a measure of how much stuff something is made of.
• On the other hand, Astro’s mass is how much stuff he’s made of – and it’s the same no matter which planet he’s on.

Astronomical units and parsecs

• The Sun and Earth are 149 million kilometres apart, and we give this distance a name: an astronomical unit (AU).
• For example, the centre of our very own galaxy, the Milky Way, is about 8,000 parsecs away from Earth, or 1.6 million AU.

Magnitudes

• In the second century BC, the ancient Greek astronomer Hipparchus looked up at space and gave the brightest stars a value of 1 and the faintest stars a value of 6.
• Even more confusing than a negative brightness, each single step in magnitude is a 2.512 times difference in brightness.
• The star Vega has an apparent magnitude of 0, which is two and a bit times brighter than the star Antares with an apparent magnitude of 1.

At last, the milliCrab

• The light we use to take pictures of your bones is called X-ray light.
• When astronomers use X-ray light to observe the sky we sometimes measure brightness in “Crabs”.
• It’s so bright in X-ray light that astronomers have been using it to calibrate their telescopes since the 1970s.

• SEOUL, South Korea, Feb. 1, 2023 /PRNewswire/ -- Samsung Electronics Co., Ltd. today unveiled the Galaxy S23 Ultra, Galaxy S23+, and Galaxy S23, marking a new era of Samsung Galaxy's ultimate premium phone experience.
• On Galaxy S23+ and Galaxy S23, the iconic Samsung Galaxy camera also gets an upgraded look.
• Samsung Multi Control,20 which connects mouse and keyboard functionality between a Samsung Galaxy PC and tablet, now extends to Galaxy S23 Ultra, Galaxy S23+, and Galaxy S23 for the ultimate flexibility between devices.
• Starting on February 17, 2023, Galaxy S23 Ultra, Galaxy S23+ and Galaxy S23 will be widely available in carriers and retailers, and on Samsung.com
  For more information about Galaxy S23 series, please visit: www.samsungmobilepress.com , https://www.samsung.com/ae/news/ or https://www.samsung.com/ae/unpacked/ .