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Astrophysicist Sheperd Doeleman awarded National Academy of Sciences Henry Draper Medal

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IMAGE: Astrophysicist Sheperd Doeleman has been awarded the National Academy of Sciences 2021 Henry Draper Medal.
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Credit: Center for Astrophysics | Harvard & Smithsonian
Sheperd (Shep) Doeleman, an astrophysicist at the Center for Astrophysics | Harvard & Smithsonian, has been named the recipient of the National Academy of Sciences 2021 Henry Draper Medal. As founding director of the Event Horizon Telescope (EHT), Doeleman is widely known for his pivotal role in capturing the first image of a supermassive black hole in 2019.
This year s Henry Draper Medal recognizes Doeleman s vision and decades-long leadership in developing the instruments and global telescope arrays necessary to produce the world s first black hole image. ....

United States , Milky Way , Magallanesy Antaica Chilena , United Kingdom , Heino Falcke , Harvard Smithsonian , Charles Alcock , Rainer Weiss , Massachusetts Institute Of Technology , National Science Foundation , National Academy Of Science , Harvard Black Hole Initiative , National Academy Of Sciences , Radboud University , Reed College , American Astronomical Society , National Academy , Event Horizon Telescope , Henry Draper Medal , Massachusetts Institute , South Pole , France Cordova , National Science , Rossi Prize , Achievement Award , Henry Draper ,

Astronomers estimate Titan's largest sea is 1,000-feet deep

Far below the gaseous atmospheric shroud on Saturn s largest moon, Titan, lies Kraken Mare, a sea of liquid methane. Cornell University astronomers have estimated that sea to be at least 1,000-feet deep near its center - enough room for a potential robotic submarine to explore. ....

Valerio Poggiali , Journal Of Geophysical Research , Propulsion Laboratory , Cornell Center , Cornell University , Kraken Mare , Moray Sinus , Planetary Science , Ligeia Mare , Great Lakes , Space Planetary Science , Planets Moons , Experiments In Space , Technology Engineering Computer Science , இதழ் ஆஃப் புவி இயற்பியல் ஆராய்ச்சி , ப்ரொபல்ஶந் ஆய்வகம் , கார்னெல் மையம் , கார்னெல் பல்கலைக்கழகம் , க்ரேகந் மேர் , மொவரே நீர் சேர்க்கை , கிரகங்கள் அறிவியல் , லிஜியா மேர் , நன்று ஏரிகள் , இடம் கிரகங்கள் அறிவியல் , கிரகங்கள் நிலவுகள் , சோதனைகள் இல் இடம் ,

Alpha particles lurk at the surface of neutron-rich nuclei

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Scientists from an international collaboration have found evidence of alpha particles at the surface of neutron-rich heavy nuclei, providing new insights into the structure of neutron stars, as well as the process of alpha decay.
Neutron stars are amongst the most mysterious objects in our universe. They contain extremely dense matter that is radically different from the ordinary matter surrounding us being composed almost entirely of neutrons rather than atoms. However, in the nucleus at the center of normal atoms, matter exists at similar densities.
Understanding the nature of matter at such extremes is important for our understanding of neutron stars, as well as the beginning, workings, and final fate of the universe, says Junki Tanaka, one of the leaders of the study. ....

Junki Tanaka , George Gamow , Zaihong Yang , Nishina Center , Nuclear Physics , Osaka University , Research Center , Accelerator Based Science , Chemistry Physics Materials Sciences , Atomic Molecular Particle Physics , Space Planetary Science , Stars The Sun , அணு இயற்பியல் , ஒசகக பல்கலைக்கழகம் , ஆராய்ச்சி மையம் , முடுக்குப்பொறி அடிப்படையிலானது அறிவியல் , வேதியியல் இயற்பியல் பொருட்கள் அறிவியல் , அணு மூலக்கூறு துகள் இயற்பியல் , இடம் கிரகங்கள் அறிவியல் , நட்சத்திரங்கள் தி சூரியன் ,

Bad Astronomy | A new nebula, StDr 56, has been discovered, but what is it?

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StDr 56, a possible planetary nebula in the constellation of Triangulum. It’s about the same size as the full Moon on the sky. Credit: Robert Pölz, Marcel Drechsler, Xavier Strottner
See? I told you. Absolutely breathtaking.
But. what
is it?
The quick version is, I don t know. The slightly more lengthy version is, it s a nebula, and probably a planetary nebula, but I have never seen one like this, and there are some baffling aspects of it I cannot explain.
StDr 56 was discovered by amateur astronomers Marcel Drechsler and Xavier Strottner, who comb through surveys of the sky looking for planetary nebulae (or PNe) winds of gas that flow from stars like the Sun when they die, blown when the star turns into a red giant. Eventually the outer layers blow away entirely, revealing the core of the star: a hot dense white dwarf. Ultraviolet light from the white dwarf excites the gas, causing it to glow. ....

Astrophotographer Robert , Xavier Strottner Robert , Marcel Drechsler , Xavier Strottner , White Dwarfs , Planetary Nebulae , Crash Course Astronomy , Milky Way , Bad Astronomy , Planetary Nebula , மார்செல் திரேச்சிலேர் , வெள்ளை குள்ளர்கள் , செயலிழப்பு நிச்சயமாக வானியல் , பால் வழி , மோசமான வானியல் , கிரகங்கள் நெபுலா ,

Testing the waters: Analyzing different solid states of water on other planets and moons

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IMAGE: Dissociation pressures of various clathrate hydrates across a range of cryogenic temperatures. The upper regions of each curve indicate stable boundaries of the clathrate hydrates. (Similar colors have been used.
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Credit: 2021 Hideki Tanaka, Okayama Univ.
Just like on Earth, water on other planets, satellites, and even comets comes in a variety of forms depending on multiple factors such as pressure and temperature. Aside from the gaseous, liquid, and solid states we are accustomed to, water can form a different type of crystalline solid called clathrate hydrate. Although they look similar to ice, clathrate hydrates have actually small water-based cages in which smaller molecules are trapped. These trapped guest molecules are essential for preserving the crystalline structure of clathrate hydrates, which would otherwise collapse into regular ice or water. ....

Hideki Tanaka , Okayama University , Planetary Science Journal , Professor Hideki Tanaka , Atomic Molecular Particle Physics , Space Planetary Science , Molecular Physics , ஹைடீகீ தனகா , ஒக்யமா பல்கலைக்கழகம் , கிரகங்கள் அறிவியல் இதழ் , ப்ரொஃபெஸர் ஹைடீகீ தனகா , அணு மூலக்கூறு துகள் இயற்பியல் , இடம் கிரகங்கள் அறிவியல் , மூலக்கூறு இயற்பியல் ,