воскресенье, 4 августа 2019 г.

Say hello to the Eskimo Nebula 👋 This nebula began forming about…


Say hello to the Eskimo Nebula 👋 


This nebula began forming about 10,000 years ago when a dying star started flinging material into space. When Sun-like stars exhaust their nuclear fuel, they become unstable and blast their outer layers of gas away into space (bad news for any planets in the area). This Hubble Space Telescope image shows a snapshot of the unworldly process.


Streams of high-energy ultraviolet radiation cause the expelled material to glow, creating a beautiful planetary nebula — a term chosen for the similarity in appearance to the round disk of a planet when viewed through a small telescope.


The Eskimo Nebula got its nickname because it resembles a face surrounded by a fur parka. The “parka” is a disk of material embellished by a ring of comet-shaped objects with their tails streaming away from the central, dying star. In the middle of the nebula is a bubble of material that is being blown outward by the star’s intense “wind” of high-speed material.


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‘Devil’s Arrows’ Prehistoric Standing Stones, Boroughbridge, Yorkshire,...

‘Devil’s Arrows’ Prehistoric Standing Stones, Boroughbridge, Yorkshire, 3.8.19.












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Stop and Smell the Hibiscus? Image of the Week — August 5,…


Stop and Smell the Hibiscus? Image of the Week — August 5, 2019


CIL:40971http://cellimagelibrary.org/images/40971


Description: Colorized scanning electron micrograph of pollen (green) from a Hibiscus rosa-sinensis grown in Ecuador, Provincia Pichincha.


Authors: Alexis Debut and Sara Guerra


Licensing: Attribution Non-Commercial Share Alike: This image is licensed under a Creative Commons Attribution, Non-Commercial, Share Alike License.


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2019 August 4 Rumors of a Dark Universe Image Credit: High-Z…


2019 August 4


Rumors of a Dark Universe
Image Credit: High-Z Supernova Search Team, HST, NASA


Explanation: Twenty-one years ago results were first presented indicating that most of the energy in our universe is not in stars or galaxies but is tied to space itself. In the language of cosmologists, a large cosmological constant – dark energy – was directly implied by new distant supernova observations. Suggestions of a cosmological constant were not new – they have existed since the advent of modern relativistic cosmology. Such claims were not usually popular with astronomers, though, because dark energy was so unlike known universe components, because dark energy’s abundance appeared limited by other observations, and because less-strange cosmologies without a signficant amount of dark energy had previously done well in explaining the data. What was exceptional here was the seemingly direct and reliable method of the observations and the good reputations of the scientists conducting the investigations. Over the two decades, independent teams of astronomers have continued to accumulate data that appears to confirm the existence of dark energy and the unsettling result of a presently accelerating universe. In 2011, the team leaders were awarded the Nobel Prize in Physics for their work. The featured picture of a supernova that occurred in 1994 on the outskirts of a spiral galaxy was taken by one of these collaborations.


∞ Source: apod.nasa.gov/apod/ap190804.html


Reconstructed Prehistoric Settlement, Yorkshire Museum of Farming, York, 3.8.19.





Reconstructed Prehistoric Settlement, Yorkshire Museum of Farming, York, 3.8.19.








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Prehistoric Cist Cairns and Funerary Settings, Merrivale Prehistoric Complex, Merrivale,...










Prehistoric Cist Cairns and Funerary Settings, Merrivale Prehistoric Complex, Merrivale, Dartmoor, 24.7.19.


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Merrivale Prehistoric Complex Roundhouse Foundations, Merrivale, Dartmoor, 24.7.19.


Merrivale Prehistoric Complex Roundhouse Foundations, Merrivale, Dartmoor, 24.7.19.











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Dyffryn Prehistoric Burial Chambers Telescopic Photoset, Dyffryn Ardudwy, North Wales,...


Dyffryn Prehistoric Burial Chambers Telescopic Photoset, Dyffryn Ardudwy, North Wales, 1.8.19.











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