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Dolphin Head Nebula Sh2-308
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Active Galactic Nuclei Are More Powerful Than Previously Thought
Powered by supermassive black holes swallowing matter in the centers of galaxies, Active Galactic Nuclei (AGN) are the most powerful compact steady sources of energy in the Universe. The brightest Active Galactic Nuclei have long been known to far outshine the combined light of the billions of stars in their host galaxies. Although the possibility of dust dimming the light from Active Galactic Nuclei has been recognized for a long time, the amount has been considered controversial and was widely believed to be negligible. Now, new research reveals that the energy output of Active Galactic Nuclei has been underestimated by not recognizing the extent to which their light is dimmed by dust and Active Galactic Nuclei (like Quasars and Blazars) are much more powerful than previously thought.
First US Satellite Explorer I – 65 Years Ago Today
During 1957, the US and the Soviet Union worked diligently on plans to orbit satellites as part of the 1958 International Geophysical Year (IGY). Given the Cold War competition between the two superpowers, the first to launch a satellite could claim technological preeminence. The Soviet Union leaped ahead of the US and stunned the world when they orbited Sputnik 1, the world's first artificial satellite on October 4, 1957. Through the combined efforts of JPL and the Army Ballistic Missile Ballistic Agency, Explorer 1 launched from Cape Canaveral, Florida on Jan. 31, 1958 -- 65 years ago today. There was a nail-biting wait before tracking stations confirmed that Explorer 1 had gone successfully into orbit around Earth. With the launch of Explorer 1, the United States officially entered the space age. Explorer 1 followed a looping flight path that orbited Earth once every 114 minutes. The satellite went as high as 2565 kilometers (1594 miles) and as low as 362 kilometers (225 miles) above Earth. Explorer 1 stopped transmitting when its batteries ran out on May 23, 1958. It stayed in orbit for a dozen years, making a fiery reentry over the Pacific Ocean on March 31, 1970.
20 Years Ago – Remembering Columbia and Her Crew
The year 2003 was shaping up to be an ambitious one for NASA, with six space shuttle missions planned, five to continue construction of the ever-growing and permanently occupied International Space Station. The first flight of the year, STS-107 aboard NASA’s oldest orbiter Columbia, the first shuttle mission dedicated to microgravity research in nearly five years, would not travel to the space station but fly a 16-day solo mission. The seven-member crew would conduct many of the 80 planned U.S. and international experiments aboard a Spacehab Double Research Module in Columbia’s payload bay. The astronauts’ exceeded scientists’ expectations in terms of the science obtained during their 16 days in space. Tragically, the astronauts perished when Columbia broke apart during reentry on Feb. 1, 2003.
Kiss the Sky Tonight -- Month of February 2023
Welcome to the night sky report for February 2023 -- Your guide to the constellations, deep sky objects, planets, and celestial events that are observable during the month. In February, the Winter Triangle is your guide to the night sky. The northern hemisphere is treated to views of the stars Procyon, Sirius, and Betelgeuse, as well as awe-inspiring views of the Orion Nebula, sculpted by the stellar winds of central bright stars. The night sky is truly a celestial showcase. Get outside and explore its wonders from your own backyard.
Astrophysicists Ask a Simple Question -- What if Dark Matter is Just Black Holes?
Proposing an alternative model for how the universe came to be, a team of astrophysicists suggests that all black holes—from those as tiny as a pin head to those covering billions of miles—were created instantly after the Big Bang and account for all dark matter. That’s the implication of a study by astrophysicists at the University of Miami, Yale University, and the European Space Agency that suggests that black holes have existed since the beginning of the universe ¬¬and that these primordial black holes could be as-of-yet unexplained dark matter. Dark matter — which has never been directly observed — is thought to constitute the majority of matter in the universe and act as the unseen scaffolding upon which galaxies form and develop. Physicists have spent years looking at a variety of dark matter candidates, including hypothetical particles such as sterile neutrinos, Weakly Interacting Massive Particles (WIMPS), and axions. If this new black hole hypothesis is proven true with data collected from the James Webb Space Telescope, the discovery may transform scientific understanding of the origins and nature of two cosmic mysteries: dark matter and black holes.
I Asked the AI Program ChatGPT to Write an Astromart Article – Here Are the Results
In December 2022, a chatbot called ChatGPT stunned the world with its impressive writing abilities. Developed by OpenAI, an Artificial Intelligence (AI) research and deployment company based in San Francisco, ChatGPT interacts with users in a simple conversational way. The quality results produced by the program have been so good that some secondary schools and colleges have already banned it for fear that students might use it to write essays. Microsoft Corporation is reportedly planning to incorporate ChatGPT into its Bing web search engine and Office products later this year. What does the unrelenting progress in AI mean for the future? Is AI likely to threaten certain jobs in the years to come? I put ChatGPT to the test and asked it to write an Astromart article. Here are the results.
Kiss the Sky Tonight -- Month of January 2023
Happy New Year and welcome to the night sky report for January 2023 -- Your guide to the constellations, deep sky objects, planets, and celestial events that are observable during the month. The January sky is filled with bright stars in the constellations Orion, Taurus, Gemini, Canis Major, and Canis Minor. Find these cosmic gems by looking toward the southeast in the first few hours after it gets dark. The northern hemisphere also features beautiful views of Capella - a pair of giant yellow stars, Aldebaran - a red giant star, two star clusters - the Hyades (Caldwell 41) and the Pleiades (M45), and the Crab Nebula (M1, NGC 1952). As a special treat during the month, Comet C/2022 E3 (ZTF) is observable with binoculars or a small telescope in the predawn sky for Northern Hemisphere observers as it works its way swiftly across the northern sky. The night sky is truly a celestial showcase. Get outside and explore its wonders from your own backyard.
75 Years Ago – Bell Telephone Laboratories Introduces the Transistor to the World – “The Most Important Invention of the 20th Century”
Seventy Five years ago, December 23, 1947, three scientists at Bell Telephone Laboratories in Murray Hill, New Jersey, demonstrated a small semiconductor device, the transistor, which had remarkable electronic amplification and switching properties. John Bardeen, Walter Brattain, and William Shockley, the three Bell Labs inventors of the transistor, had been investigating the properties of semiconductors to see if they could come up with an acceptable substitute for the vacuum tubes and electro-mechanical relays used in telephone networks of the day. Little did they know that their invention would change the world. Today, there are transistors in every place where an electronic device can be found, including satellites and spacecraft. The transistor is the workhorse of electronic technology -- the device that heralded the start of the digital age. Transistors are the basic building block of all integrated circuits. Entire industries based on semiconductors were created in its wake. Indeed, technology as we know it today would not be possible without the transistor.
50 Years Ago Today – The Day We Left the Moon… “God Willing, We Shall Return”
Fifty years ago today, the crew of Apollo 17 completed humanity’s last voyage to the Moon, leaving the lunar surface for the final time. On December 14, 1972, Commander Gene Cernan spoke the now famous quote, “We leave as we came and God willing, we shall return -- with peace and hope for all mankind.” On November 16 of this year, NASA took the next major step in returning to the Moon with the launch of Artemis I. Millions around the world watched live as the Space Launch System (SLS) rocket launched the Orion spacecraft on its 25 day mission that saw the un-crewed vehicle log over 1.4 million miles and travel farther (40,000 miles beyond the far side of the Moon) than any human-rated spacecraft has ever traveled. Orion made its initial flight around the Moon and has returned stunning images rivaling the Apollo 8 “Earthrise.” This historic milestone represents a truly monumental achievement. But this is only the first step.
65 Years Ago – US is Humiliated in its First Attempt to Launch a Satellite into Orbit
The Vanguard launch vehicle was selected by the US for its first attempt to launch a satellite into orbit around the Earth as part of the International Geophysical Year (IGY). The USSR had already launched two Sputnik satellites, with one carrying a dog into orbit, as the US prepared for its first attempt. On December 6, 1957, the Vanguard booster ignited, but about 2 seconds after liftoff, after rising about four feet, the rocket lost thrust and began to crash back down onto the launch pad. As it sank into the launch pad, the fuel tanks ruptured and exploded, destroying the rocket and severely damaging the launch pad. The Vanguard satellite was thrown clear and landed on the ground a short distance away with its transmitters still sending out a beacon signal as it rolled across the ground. It was a humiliating failure. In New York City, members of the Soviet delegation to the United Nations sarcastically asked American delegates if the United States would be interested in receiving aid under USSR's program of technical assistance for backward nations. But by the end of the year, America’s attention was riveted on the efforts of the Army-JPL team to prepare Jupiter-C for an Explorer I satellite-launch attempt, tentatively scheduled for late January l958.
Kiss the Sky Tonight -- Month of December 2022
Welcome to the night sky report for December 2022 -- Your guide to the constellations, deep sky objects, planets, and celestial events that are observable during the month. The Moon sweeps past Jupiter twice this month, and actually covers Mars completely, in an event called an occultation, on December 7th. The event is visible across the U.S., except for the Southeast and East Coast, where the Moon will graze closely past Mars. Step outside on a cold December night when the stars shine bright to find the Big Dipper, Cassiopeia, and Cepheus. They will help you locate a binary star system (Eta Cassiopeiae), a fan-shaped open star cluster (M103 or NGC 581), and a variable star (Mu Cephei). Also, throughout the month, you can find Pegasus, the winged stallion, high overhead in the south. The night sky is truly a celestial showcase. Get outside and explore its wonders from your own backyard.
ESA Finds a Black Hole Only 1600 Light-Years from Earth
Using data from ESA’s Gaia astrometry mission, astronomers have identified the closest known black hole, less than 1600 light-years away from Earth and have determined its mass. The black hole is orbiting a star similar to our Sun, and was identified by tracking the star that the black hole is orbiting. It is expected to be the first one of many black holes to be discovered using the same method. At the same time, the properties of the binary star system are unexpected, indicating a serious gap in astronomers’ understanding of how such systems form in the first place.
55 Years Ago – The Saturn V Mega-Rocket Flies for the First Time
Fifty five years ago, on November 9, 1967, the first Saturn V rocket, carrying the unmanned Apollo 4 spacecraft, launched from NASA’s Kennedy Space Center (KSC). Scientists calculated that the noise created by the launch was one of the loudest ever on Earth, natural or man-made. The vibrations rattled the press site several miles away as the rocket cleared the launch tower. The mission objectives included testing of structural integrity of the mega-rocket, the compatibility of the rocket and Apollo spacecraft, heat shield and thermal seal integrity, overall reentry operations, launch load and dynamic characteristics, stage separations, rocket subsystems, the emergency detection system, and mission support facilities and operations. All mission objectives were achieved. NASA's Marshall Space Flight Center designed, developed, and managed the production of the Saturn family of rockets that eventually took astronauts to the Moon in 1969. Today, Marshall is developing NASA's Space Launch System (or SLS, sometimes referred to as a “Saturn V on Steroids”), the most powerful rocket ever built, capable of sending astronauts to the Moon, Mars, and deeper into space than ever before.
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