Public Posts
“I have a foreboding of an America in my children’s or grandchildren’s time – when the United States is a service and information economy; when nearly all the key manufacturing industries have slipped away to other countries; when awesome technological powers are in the hands of a very few, and no one representing the public interest can even grasp the issues; when the people have lost the ability to set their own agendas or knowledgeably question those in authority; when, clutching our crystals and nervously consulting our horoscopes, our critical faculties in decline, unable to distinguish between what feels good and what’s true, we slide, almost without noticing, back into superstition and darkness"
Carl Edward Sagan (1934 – 1996) ~ American astronomer, planetary scientist and science communicator. He was one of the most well-known scientist of the 1970's and 1980's . He was controversial in scientific, political, and religious circles for his views on extraterrestrial intelligence, nuclear weapons, and religion. His best known scientific contribution is his research on the possibility of extraterrestrial life. He was an advocate for nuclear disarmament and co-wrote and hosted 'Cosmos: A Personal Voyage.' He was widely regarded as a freethinker and one of his most famous quotations, in Cosmos, was, "Extraordinary claims require extraordinary evidence. He died at the age of 62 from complications of Myelodysplastic Syndrome (MDS). More
Note: The book Demon-Haunted World by Carl Sagan explains why scientific thinking is crucial for navigating today's complex world and it offers insights on how we can separate fact from fiction and think critically, empowering us to make informed decisions.
Supernova Remnant Cassiopeia A • 01/17/25
NASA Astronomy Picture of the Day:
Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their cores. After only a few million years for the most massive stars, the enriched material is blasted back into interstellar space where star formation can begin anew. The expanding debris cloud known as Cassiopeia A is an example of this final phase of the stellar life cycle. Light from the supernova explosion that created this remnant would have been first seen in planet Earth's sky about 350 years ago, although it took that light 11,000 years to reach us. This sharp NIRCam image from the James Webb Space Telescope shows the still hot filaments and knots in the supernova remnant. The whitish, smoke-like outer shell of the expanding blast wave is about 20 light-years across. A series of light echoes from the massive star's cataclysmic explosion are also identified in Webb's detailed images of the surrounding interstellar medium.
Picture of the Day 01/17/25 - Wikimedia Commons
Legend of the Holy Ermite by an unknown artist of the Cologne School of Painting depicts the life of Anthony the Great, one of the Desert Fathers known as the Father of All Monks. Today is his feast day in most of Christianity.
Meister der Heiligen Sippe der Ältere, Public domain, via Wikimedia Commons. View source.
Word of the Day 01/17/25: brackish
M83: The Southern Pinwheel
NASA Astronomy Picture of the Day:
Beautiful and bright spiral galaxy M83 lies a some twelve million light-years away, near the southeastern tip of the very long constellation Hydra. Prominent spiral arms traced by dark dust lanes and blue star clusters lend this galaxy its popular name, The Southern Pinwheel. Still, reddish star forming regions that dot this cosmic pinwheel's spiral arms have suggested another nickname, the Thousand-Ruby Galaxy. A mere 40,000 light-years across, smaller than the Milky Way, M83 is a member of a group of galaxies that includes active galaxy Centaurus A. In fact, the core of M83 itself is bright at x-ray energies, showing a high concentration of neutron stars and black holes left from an intense burst of star formation. This sharp color image also features spiky foreground Milky Way stars and distant background galaxies. The image data was captured with the Dark Energy Camera and Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory.
Picture of the Day 01/16/25 - Wikimedia Commons
Focus stacked image (composed of 59 frames) of a trilobite of the species Austerops speculator found in Jebel Oufatene, Morocco. It lived in the early Devonian period and is approximately 400 million years old. The length of the fossil is about 3 centimetres (1.2 in).
Diego Delso, CC BY-SA 4.0, via Wikimedia Commons. View source.
Word of the Day 01/16/25: marmalade
Wolf Moon Engulfs Mars
NASA Astronomy Picture of the Day:
Does the Moon ever engulf Mars? Yes, but only in the sense that it moves in front, which happens on rare occasions. This happened just yesterday, though, as seen from some locations in North America and western Africa. This occultation was notable not only because the Moon was a fully lit Wolf Moon, but because Mars was near its largest and brightest, moving to opposition -- the closest to the Earth in its orbit -- only tomorrow. The engulfing, more formally called an occultation, typically lasting about an hour. The featured image was taken from near Chicago, Illinois, USA just as Earth's largest satellite was angularly moving away from the much more distant red planet. Our Moon occasionally moves in front of all of the Solar System's planets. Given the temporary alignment of orbital planes, the next time our Moon eclipses Mars will be a relatively soon February 9. Growing Gallery: Moon-Mars Occultation in January 2025
Photo by Imran Sultan
Picture of the Day 01/15/25 - Wikimedia Commons
Cluster of Breath roots (pneumatophores) of a Taxodium distichum at the water's edge. Focus stack of 4 photos.
Dominicus Johannes Bergsma, CC BY-SA 4.0, via Wikimedia Commons. View source.
Word of the Day 01/15/25: Vibrissa
North Star: Polaris and Surrounding Dust • 01/14/25
NASA Astronomy Picture of the Day:
Why is Polaris called the North Star? First, Polaris is the nearest bright star toward the north spin axis of the Earth. Therefore, as the Earth turns, stars appear to revolve around Polaris, but Polaris itself always stays in the same northerly direction -- making it the North Star. Since no bright star is near the south spin axis of the Earth, there is currently no bright South Star. Thousands of years ago, Earth's spin axis pointed in a slightly different direction so that Vega was the North Star. Although Polaris is not the brightest star on the sky, it is easily located because it is nearly aligned with two stars in the cup of the Big Dipper. Polaris is near the center of the five-degree wide featured image, a digital composite of hundreds of exposures that brings out faint gas and dust of the Integrated Flux Nebula (IFN) all over the frame. The surface of Cepheid Polaris slowly pulsates, causing the famous star to change its brightness by a few percent over the course of a few days. Today: Zoom APOD Lecture hosted by the Amateur Astronomers of Association of New York
Photo by Davide Coverta