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NASA Astronomy Picture of the Day:

Sometimes a river of hot gas flows over your head. In this case the river created a Strong Thermal Emission Velocity Enhancement (STEVE) that glowed bright red, white, and pink. Details of how STEVEs work remain a topic of research, but recent evidence holds that their glow results from a fast-moving river of hot ions flowing over a hundred kilometers up in the Earth's atmosphere: the ionosphere. The more expansive dull red glow might be related to the flowing STEVE, but alternatively might be a Stable Auroral Red (SAR) arc, a more general heat-related glow. The featured picture, taken earlier this month in Côte d'Opale, France, is a wide-angle digital composite made as the STEVE arc formed nearly overhead. Although the apparition lasted only a few minutes, this was long enough for the quick-thinking astrophotographer to get in the picture -- can you find him?

Photo by Louis LEROUX-GÉRÉ

 "The plight of Palestinian civilians trapped in North Gaza is unbearable. Just in the past few weeks, hundreds of people have been killed, according to Gaza’s Ministry of Health, and more than 60,000 others have been forced to flee yet again, many fearing not being able to return.  

The Secretary-General is shocked by the harrowing levels of death, injury and destruction in the north, with civilians trapped under rubble, the sick and wounded going without life-saving health care, and families lacking food and shelter, amid reports of families being separated and many people detained. 

Repeated efforts to deliver humanitarian supplies essential to survive – food, medicine and shelter – continue to be denied by the Israeli authorities, with few exceptions, putting countless lives in peril. The postponement of the final phase of the polio vaccination campaign in northern Gaza is putting the lives of thousands of children at risk.

The Secretary-General warns that the widespread devastation and deprivation resulting from Israel’s military operations in North Gaza – especially around Jabalya, Beit Lahiya and Beit Hanoun – are making the conditions of life untenable for the Palestinian population there. This conflict continues to be waged with little regard for the requirements of international humanitarian law. 

The Secretary-General underscores that the parties to the conflict must respect and protect civilians, including humanitarian workers and first responders whose vital work must be facilitated and protected – not impeded and jeopardized.

In the name of humanity, the Secretary-General reiterates his calls for an immediate ceasefire, the immediate and unconditional release of all hostages, and accountability for crimes under international law."

"On this 18th anniversary of the birth of The Marginalian, here are all of these learnings so far as they were originally written in years past, beginning with the present year’s — the most challenging and most transformative of my life.". Read more at The Marginalian

NASA Astronomy Picture of the Day:

What is the most spook-tacular nebula in the galaxy? One contender is LDN 43, which bears an astonishing resemblance to a vast cosmic bat flying amongst the stars on a dark Halloween night. Located about 1400 light years away in the constellation Ophiuchus, this molecular cloud is dense enough to block light not only from background stars, but from wisps of gas lit up by the nearby reflection nebula LBN 7. Far from being a harbinger of death, this 12-light year-long filament of gas and dust is actually a stellar nursery. Glowing with eerie light, the bat is lit up from inside by dense gaseous knots that have just formed young stars. Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)

Photo by Mark Hanson and Mike Selby; Text: Michelle Thaller (NASA's GSFC)

NASA Astronomy Picture of the Day:

These brightly outlined flowing shapes look ghostly on a cosmic scale. A telescopic view toward the constellation Cassiopeia, the colorful skyscape features the swept-back, comet-shaped clouds IC 59 (left) and IC 63. About 600 light-years distant, the clouds aren't actually ghosts. They are slowly disappearing though, under the influence of energetic radiation from hot, luminous star gamma Cas. Gamma Cas is physically located only 3 to 4 light-years from the nebulae and lies just above the right edge of the frame. Slightly closer to gamma Cas, IC 63 is dominated by red H-alpha light emitted as hydrogen atoms ionized by the hot star's ultraviolet radiation recombine with electrons. Farther from the star, IC 59 shows less H-alpha emission but more of the characteristic blue tint of dust reflected star light. The field of view spans over 1 degree or 10 light-years at the estimated distance of the interstellar apparitions.

Photo by Christophe Vergnes

"A new type of absorbing material developed by chemists at the University of California, Berkeley, could help get the world to negative emissions. The porous material — a covalent organic framework (COF) — captures CO2 from ambient air without degradation by water or other contaminants, one of the limitations of existing DAC technologies."  More at UC Berkeley News ➜

NASA Astronomy Picture of the Day:

Some 13,000 light-years away toward the southern constellation Pavo, the globular star cluster NGC 6752 roams the halo of our Milky Way galaxy. Over 10 billion years old, NGC 6752 follows clusters Omega Centauri, 47 Tucanae, and Messier 22 as the fourth brightest globular in planet Earth's night sky. It holds over 100 thousand stars in a sphere about 100 light-years in diameter. Telescopic explorations of NGC 6752 have found that a remarkable fraction of the stars near the cluster's core, are multiple star systems. They also reveal the presence of blue straggle stars, stars which appear to be too young and massive to exist in a cluster whose stars are all expected to be at least twice as old as the Sun. The blue stragglers are thought to be formed by star mergers and collisions in the dense stellar environment at the cluster's core. This sharp color composite also features the cluster's ancient red giant stars in yellowish hues. (Note: The bright, spiky blue star about 8 o'clock from the cluster center is a foreground star along the line-of-sight to NGC 6752)

Photo by Massimo Di Fusco