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NASA Astronomy Picture of the Day:

What causes unusual knots of gas and dust in planetary nebulas? Seen also in the Ring Nebula, the Dumbbell Nebula and NGC 2392, the knots' existence was not initially predicted, and their origins are still not well understood. Pictured here is a fascinating image of part of the Helix Nebula by the James Webb Space Telescope showing tremendous detail in infrared light. The cometary knots have masses similar to the Earth but have sizes typically several times the orbit of Pluto. One hypothesis for the fragmentation and evolution of the knots includes existing gas being driven out by a less dense but highly energetic stellar wind of the central evolving star. The Helix Nebula is one of the closest examples of a planetary nebula created at the end of the life of a Sun-like star. Given a technical designation of NGC 7293, the Helix Nebula lies about 650 light-years away towards the constellation of Water Carrier (Aquarius). Open Science: Browse 4,000+ codes in the Astrophysics Source Code Library

Photography Series CONTRIBUTOR
History Series CONTRIBUTOR

Indian Mathematics and the Invention of Zero || Kudos365 History Series | The Past that shaped us

Among the greatest intellectual achievements in human history was the development of the number zero as both a numeral and a mathematical concept. While many ancient civilizations used symbols to indicate an empty space in numerical notation, it was in India that zero became a true number with defined mathematical properties. This breakthrough fundamentally changed mathematics, science, engineering, commerce, and eventually modern computing.

Science and Technology Series CONTRIBUTOR

NASA Astronomy Picture of the Day:

What's happening to this meteor? This bright meteor streak appeared and disappeared quickly during a long exposure of the Great Lacerta Nebula, seen faintly in red toward the center of the image. The meteoroid, likely a small pebble, creates its glow partly by heating and exciting surrounding air in Earth's atmosphere, but itself vaporizes and leaves wind-blown gas and dust with colors that give clues to its composition. The featured image was captured last month from Death Valley Observatories in Nevada, USA. This month, though, is particularly good for seeing meteors. Presently there are three meteor showers ongoing, although they are currently competing for visibility with the glow of a bright gibbous Moon. The most active of these showers, the Perseids, will be busiest in about 10 days -- after the Moon has dimmed considerably. This year, the Perseids peak nearly coincides with not only a new Moon, but, from some locations, one that totally eclipses the Sun. Sky Surprise: What picture did APOD feature on your birthday? (after 1995)

Photo by Tom Burnett

Photography Series CONTRIBUTOR
Science and Technology Series CONTRIBUTOR

NASA Astronomy Picture of the Day:

What's happening to this cloud? Ice crystals in a distant cirrus cloud are acting like little floating prisms. Known informally as a fire rainbow for its flame-like appearance, a circumhorizon arc appears parallel to the horizon. For a circumhorizontal arc to be visible, the Sun must be at least 58 degrees high in a sky where cirrus clouds present below -- in this case cirrus fibratus. The numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight in a collectively similar manner. Therefore, circumhorizontal arcs are somewhat unusual to see. The featured fire rainbow was photographed in 2021 near North Fork Mountain in West Virginia, USA. Sky Surprise: What picture did APOD feature on your birthday? (after 1995)

Photo by Christa Harbig

Photography Series CONTRIBUTOR
Life Series CONTRIBUTOR

Enjoying Nature Close to Home | Kudos365 Life Series

It is easy to think that experiencing nature requires a trip to a national park or a distant mountain trail. Yet some of life's most rewarding moments outdoors can be found much closer to home. A neighborhood park, a quiet walking path, a backyard garden, or even a favorite tree along a familiar street can provide opportunities to slow down, observe, and reconnect with the natural world.

History Series CONTRIBUTOR

A Public Post by Kronos

Posted by Kronos • Profile • 08/01/26 at 10:00PM • History • See more by Kronos

The USS SC-1068  and future Air Snipe  || Kudos365 | HISTORICAL SERIES


The Beginning 

On April 13, 1943, the United States Navy commissioned USS SC-1068, a member of the SC-497 class, of 148 wooden-hulled submarine chasers, built to strengthen America's coastal defense and convoy escort capabilities during World War II. Although she would later become known as USCGC Air Snipe, her military career began as a Navy anti-submarine vessel designed to protect Allied shipping from the growing threat of German and Japanese submarines. 

Science and Technology Series CONTRIBUTOR

NASA Astronomy Picture of the Day:

The Buck Moon is a traditional name for the full moon of July. In this colorful Adriatic sea and skyscape captured on July 28 from Krk Island along the coast of Croatia, a full Buck Moon is just rising over distant mountains. Since a full moon rises as the Sun sets, Earth's shadow also rises in the twilight scene, a diffuse gray band extending above the mountainous southeastern horizon. Above Earth's shadow band is the pinkish antitwilight arch. That subtly tinted band of backscattered sunlight is more widely known as the Belt of Venus. But as it shares the eastern horizon with the atmospheric shadow of Earth and Belt of Venus, this full Buck Moon seems to set the stage for the New Moon to come. The New Moon of August 12 will cast its shadow on planet Earth in a much anticipated total solar eclipse.

Photo by Branko Nadj

Photography Series CONTRIBUTOR

Ceiling of Sala della Stufa, Galleria Palatina, Palazzo Pitti, Florence. The room, created between 1627 and 1641, was originally an open gallery, but it was closed off later in the 17th century and restructured as a “stove” room, a bathroom heated using the same techniques as the Roman baths and intended for private use by the Grand Duke, whose bedroom is believed to be next door. The decoration, specially the frescos and stuccos, commissioned by Grand Duke Ferdinand II de' Medici, are a work of Michelangelo Cinganelli (1558-1635) Matteo Rosselli (1578-1650) and Ottavio Vannini (1585–1643).

Diego Delso, CC BY-SA 4.0, via Wikimedia Commons. View source.

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