Showing posts with label Jerry Ehman. Show all posts
Showing posts with label Jerry Ehman. Show all posts
Tuesday, January 12, 2016
Mysterious 'Wow' Signal Not From Aliens, Argues Astronomer
A powerful radio signal received from space in 1977 and never explained may have been the result of a then-unknown comet, not extraterrestrials, an astronomer proposes in a new paper.
The "Wow! signal" is named after what astronomer Jerry Ehman wrote ("Wow!") next to the paper readout of the radio telescope that recorded it. The signal was very powerful and emanated briefly from a single point in the sky, right at a wavelength many have suggested would be a natural one for extraterrestrial life to transmit in [....]
But Antonio Paris at St. Petersburg College in Florida has found that two comets, yet to be identified in 1977, were in just the right position, and due to their halo of hydrogen might have given off energy in the right wavelength. [...]
Saturday, February 18, 2012
The 'Wow!' Signal: One Man's Search for SETI's Most Tantalizing Trace of Alien Life
For decades, Robert Gray has been trying to duplicate the most surprising and still-unexplained observation in the history of the search for extraterrestrial life.
Late one night in the summer of 1977, a large radio telescope outside Delaware, Ohio intercepted a radio signal that seemed for a brief time like it might change the course of human history. The telescope was searching the sky on behalf of SETI, the Search for Extraterrestrial Intelligence, and the signal, though it lasted only seventy-two seconds, fit the profile of a message beamed from another world. Despite its potential import, several days went by before Jerry Ehman, a project scientist for SETI, noticed the data. He was flipping through the computer printouts generated by the telescope when he noticed a string of letters within a long sequence of low numbers---ones, twos, threes and fours. The low numbers represent background noise, the low hum of an ordinary signal. As the telescope swept across the sky, it momentarily landed on something quite extraordinary, causing the signal to surge and the computer to shift from numbers to letters and then keep climbing all the way up to "U," which represented a signal thirty times higher than the background noise level. Seeing the consecutive letters, the mark of something strange or even alien, Ehman circled them in red ink and wrote "Wow!" thus christening the most famous and tantalizing signal of SETI's short history: The "Wow!" signal.
Despite several decades of searching, by amateur and professional astronomers alike, the "Wow!" signal has never again been found. In his new book, The Elusive Wow,
amateur astronomer Robert Gray tells the story of the "Wow!" signal, and of astronomy's quest to solve the puzzle of its origin. It's a story he is well-positioned to tell. That's because Gray has been the "Wow!" signal's most devoted seeker and chronicler, having traveled to the very ends of the earth in search of it. Gray has even co-authored several scientific articles about the "Wow!" signal, including a paper detailing his use of the Very Large Array Radio Observatory in New Mexico to search for it. I spoke with Gray about the "Wow!" signal, radio telescopes, and the economics of prospective extraterrestrial civilizations.From a technical standpoint, what makes the "Wow!" signal so extraordinary?
