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Posts Tagged ‘astronomy

“Any eavesdropping alien civilization will know all about our TV programs (probably a bad thing), will hear all our FM music (probably a good thing)*…

 

The speed of light, at which radio waves propagate into space, is fast– really fast– but it’s not instant.  So what a space traveler would hear at ever-greater distances from Earth is an ever-older playlist of radio hits.

Hear them for yourself at Lightyear.fm.

* “FM signals and those of broadcast television…[travel] out to space at the speed of light. Any eavesdropping alien civilization will know all about our TV programs (probably a bad thing), will hear all our FM music (probably a good thing), and know nothing of the politics of AM talk-show hosts (probably a safe thing)…”

-Neil DeGrasse Tyson, Death By Black Hole, p. 172

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As we aim for about 50 LY out, we might recall that it was on this date in 1850 that Harvard Observatory director William Cranch Bond and Boston photographer John Adams Whipple took a daguerreotype of Vega– the first photograph of a star ever made.

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Written by LW

July 17, 2015 at 1:01 am

“Everyone’s quick to blame the alien”*…

 

In August of 1977, volunteer astronomer Jerry Ehman reviewed readings from Ohio State’s Big Ear Radio Observatory (that’s a scan, above, of Ehman’s notations on the print-out he was assessing)…

He was sitting in his kitchen when he spotted a pattern that a couple of physicists had theorized 18 years earlier would signify alien chatter, according to Michael Brooks, the author of 13 Things That Don’t Make Sense . The printout read 6EQUJ5, a human way of cataloging the 72-second burst of sound registering at a frequency of 1420 MHz. The significance? E.T. may have phoned our home long before Spielberg set otherworldly hearts aglow with his 1982 film…

Scientists have rules out terrestrial sources– the signal came from “out there.”  So there are two possibilities: It was an actual alien communication, or Ehman stumbled across a previously undiscovered natural astrophysical phenomenon.  And as H. Paul Shuch (an engineer, radio astronomer, and executive director emeritus of the SETI League) observes, “either one would be worthy of a Nobel Prize, if only we knew which.”

Read the whole story at “The ‘Wow’ Signal. or That Time Jerry Ehman May Have Heard From Aliens.”

* Aeschylus, The Suppliant Maidens

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As we phone home, we might spare a thought for Martin Gardner; he died on this date in 2010.  Though not an academic, nor ever a formal student of math or science, he wrote widely and prolifically on both subjects in such popular books as The Ambidextrous Universe and The Relativity Explosion and as the “Mathematical Games” columnist for Scientific American.  Indeed, his elegant– and understandable– puzzles delighted professional and amateur readers alike, and helped inspire a generation of young mathematicians.

Gardner’s interests were wide; in addition to the math and science that were his power alley, he studied and wrote on topics that included magic, philosophy, religion, and literature (c.f., especially his work on Lewis Carroll– including the delightful Annotated Alice— and on G.K. Chesterton).  And he was a fierce debunker of pseudoscience: a founding member of CSICOP, and contributor of a monthly column (“Notes of a Fringe Watcher,” from 1983 to 2002) in Skeptical Inquirer, that organization’s monthly magazine.

 

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Written by LW

May 22, 2015 at 1:01 am

“Outer space is so empty”*…

 

At the furthest-most reaches of the observable universe lies one of the most enigmatic mysteries of modern cosmology: the cosmic microwave background (CMB) Cold Spot.

Discovered in 2004, this strange feature etched into the primordial echo of the Big Bang has been the focus of many hypotheses — could it be the presence of another universe? Or is it just instrumental error? Now, astronomers may have acquired strong evidence as to the Cold Spot’s origin and, perhaps unsurprisingly, no multiverse hypothesis is required. But it’s not instrumental error either…

The Cold Spot area resides in the constellation Eridanus in the southern galactic hemisphere. The insets show the environment of this anomalous patch of the sky as mapped using PS1 and WISE data and as observed in the cosmic microwave background temperature data taken by the Planck satellite. The angular diameter of the vast supervoid aligned with the Cold Spot, which exceeds 30 degrees, is marked by the white circles.

 

More at “Mysterious ‘Cold Spot’: Fingerprint of Largest Structure in the Universe?

* Theodore Sturgeon

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As we boldly go, we might recall that it was on this date in 1962 that NASA launched the Ranger 4, the first U.S. spacecraft to reach another celestial body.  Ranger 4 was designed to transmit pictures to Earth and to test the radar-reflectivity of the lunar surface during a period of 10 minutes of flight prior to crashing upon the Moon, “rough-landing” a seismometer capsule as it did.  In the event, an onboard computer glitch caused failure of the solar panels and navigation systems; as a result the spacecraft crashed on the far side of the Moon three days after it’s launch without returning any scientific data.  Still, the “landing” was a first.

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 Happy Shakespeare’s Birthday!

 

Written by LW

April 23, 2015 at 1:01 am

“Listen now for the sound that forevermore separates the old from the new!”*…

 

Telstar

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Newton Minow, famed Chairman of the FCC during the Kennedy Administration, recalled visiting NASA with the President, who asked him about a satellite they were shown:

I told him that it would be more important than sending a man into space. “Why?” he asked. “Because,” I said, “this satellite will send ideas into space, and ideas last longer than men.”

Greg Roberts, a retired astronomer and ham radio operator (ZS1BI in Cape Town) has been observing and recording the sounds broadcast by satellites since 1957.  He’s collected his recordings so that one can hear “ideas traveling through space,” for example, Telstar.

Hear them all at “Sounds from Space.”

* NBC News, introducing the “beep-beep” chirp transmitted by the Sputnik satellites

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As we look to the skies, we might recall that it was on this date in 1781 that English astronomer William Herschel detected every schoolboy’s favorite planet, Uranus, in the night sky (though he initially thought it was a comet:; it was the first planet to be discovered with the aid of a telescope.  In fact, Uranus had been detected much earlier– but mistaken for a star:  the earliest likely observation was by Hipparchos, who in 128BC seems to have recorded the planet as a star for his star catalogue, later incorporated into Ptolemy’s Almagest.  The earliest definite sighting was in 1690 when John Flamsteed observed it at least six times, cataloguing it as the star 34 Tauri.

Herschel named the planet in honor of his King: Georgium Sidus (George’s Star), an unpopular choice, especially outside England; argument over alternatives ensued.  Berlin astronomer Johann Elert Bode came up with the moniker “Uranus,” which was adopted throughout the world’s astronomical community by 1850.

Uranus, photographed by Voyager 2 in 1986.

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Written by LW

March 13, 2015 at 1:01 am

“Just because you’re paranoid doesn’t mean they aren’t after you”*…

 

Pieter Bruegel the Elder, “The Triumph of Death” c. 1562

 

Researchers at Oxford University have compiled a “scientific assessment about the possibility of oblivion”

The scientists from the Global Challenges Foundation and the Future of Humanity Institute used their research to draw up a list of the 12 most likely ways human civilization could end on planet earth.

“[This research] is about how a better understanding of the magnitude of the challenges can help the world to address the risks it faces, and can help to create a path towards more sustainable development,” the study’s authors said.

“It is a scientific assessment about the possibility of oblivion, certainly, but even more it is a call for action based on the assumption that humanity is able to rise to challenges and turn them into opportunities.”

* Joesph Heller, Catch-22

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As we count the ways, we might send heavenly birthday greetings to Nicolaus Copernicus. the Renaissance polyglot and polymath– he was a canon lawyer, a mathematician, a physician,  a classics scholar, a translator, a governor, a diplomat, and an economist– best remembered as an astronomer ; he was born on this date in 1473.  Copernicus’ De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres; published just before his death in 1543), with its heliocentric account of the solar system, is often regarded as the beginning both of modern astronomy and of the scientific revolution.

Of all discoveries and opinions, none may have exerted a greater effect on the human spirit than the doctrine of Copernicus. The world had scarcely become known as round and complete in itself when it was asked to waive the tremendous privilege of being the center of the universe. Never, perhaps, was a greater demand made on mankind – for by this admission so many things vanished in mist and smoke! What became of our Eden, our world of innocence, piety and poetry; the testimony of the senses; the conviction of a poetic – religious faith? No wonder his contemporaries did not wish to let all this go and offered every possible resistance to a doctrine which in its converts authorized and demanded a freedom of view and greatness of thought so far unknown, indeed not even dreamed of.

– Goethe

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“This world is but a canvas to our imagination”*…

 

The 1603 Sphaera stellifera globe by Willem Janszoon Blaeu showcases cutting-edge seventeenth-century astronomy in three dimensions. Designed by printmaker Jan Saenredam, it is also stunningly beautiful. It features highly accurate observations of the Northern Hemisphere, and pictures the newly discovered constellations of the Southern sky, offering them as heavenly proof of the success of the Dutch colonial enterprise…

Read more– and find a version that you can zoom and turn online– at “Spin a 3-D Representation of a Beautiful 17th-Century Celestial Globe.”

* Henry David Thoreau

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As we locate ourselves, we might recall that it was on this date in 1790 that the  Aztec Calendar Stone (or Sun Stone or Stone of the Five Eras), which had been buried by Spanish conquistadors at El Zocalo in Mexico City, was rediscovered during repairs to the Cathedral there.  Perhaps the most famous work of Aztec sculpture, it depicts the five eras (the Five Suns) of Aztec civilization; and, while it is called “calendar stone,” it appears to have been used as a ceremonial basin or ritual altar.

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Written by LW

December 17, 2014 at 1:01 am

“A computer once beat me at chess, but it was no match for me at kick boxing”*…

 

J. Presper Eckert, foreground left, and John W. Mauchly, leaning against pole, are pictured with the Electronic Numerical Integrator and Computer (ENIAC) at the University of Pennsylvania in 1946. Mauchly and Eckert were the masterminds behind ENIAC, arguably the first modern computer. When it was fully operational, ENIAC filled up a room 30 x 50 feet and weighed 50 tons. Every second it was on, it used enough electricity to power a typical Philadelphia home for a week and a half.

 

The ENIAC— or least a good bit of it– has been saved…

Eccentric billionaires are tough to impress, so their minions must always think big when handed vague assignments. Ross Perot’s staffers did just that in 2006, when their boss declared that he wanted to decorate his Plano, Texas, headquarters with relics from computing history. Aware that a few measly Apple I’s and Altair 880’s wouldn’t be enough to satisfy a former presidential candidate, Perot’s people decided to acquire a more singular prize: a big chunk of ENIAC, the “Electronic Numerical Integrator And Computer.” The ENIAC was a 27-ton, 1,800-square-foot bundle of vacuum tubes and diodes that was arguably the world’s first true computer. The hardware that Perot’s team diligently unearthed and lovingly refurbished is now accessible to the general public for the first time, back at the same Army base where it almost rotted into oblivion…

Read the whole story– and see more photos of computing, v1.0– at “How the World’s First Computer Was Rescued From the Scrap Heap.”

* Emo Philips

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As we praise the preservationists, we might recall that it was on this date in 1967 that Jocelyn Bell Burnell and Antony Hewish observed the first pulsar– “pulsating radio star.”  A highly-magnetized, rotating neutron star, a pulsar emits a beam of electromagnetic radiation that can only be detected on Earth when it is being beamed in our direction (so seems, from Earth’s vantage, to be pulsing).  Pulsars have short, regular rotational periods, so produce the pulses that we detect at very precise intervals.

Schematic view of a pulsar. The sphere in the middle represents the neutron star, the curves indicate the magnetic field lines, the protruding cones represent the emission beams and the green line represents the axis on which the star rotates.

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Written by LW

November 28, 2014 at 1:01 am

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