In Class Break 50 Curiously the signal was picked up by only one of the scopes

In class break 50 curiously the signal was picked up

This preview shows page 49 - 52 out of 58 pages.

In-Class Break
Image of page 49

Subscribe to view the full document.

50 Curiously, the signal was picked up by only one of the scope's two detectors. When the second detector covered the same patch of sky three minutes later, it heard nothing. This indicated either the unlikely possibility that the first beam had detected something that wasn't there, or that the source of the signal had been shut off or redirected in the intervening time. The observatory researchers trained their massive scope on that part of the sky for a full month, watching closely for a repeat of the mysterious signal. Nothing interesting was observed during those thirty days, yet scientists were at a loss for an explanation of the original event. Planning to return to that patch of sky periodically, the Big Ear continued its broader purpose. Several times over the next twenty years, long-time SETI researcher Robert Gray and his colleague Kevin B. Marvel arranged for further scans of that region of space. They managed to obtain some time on the META array at the Oak Ridge Observatory in Massachusetts, and the extremely sensitive Very Large Array (VLA) in New Mexico, which is made up of twenty-seven 25-meter radio dishes. They detected some extremely faint sources of radio emissions in the infamous patch of sky, but nothing like that of the "Wow!" signal. However their findings did essentially disprove the only working theory as to the cause of the original event: "interstellar scintillation." It was thought that perhaps some weaker radio signal from space had been temporarily focused on the Big Ear in a way similar to stars twinkling... but the VLA is sensitive enough that it would have detected such a source, and it did not. The Big Ear maintained its periodic scan of that part of space for almost forty years, and never again came across such a compelling signal. It was dismantled in 1998 to make way for a golf course. "Wow" remains the strongest and clearest signal ever received from an unknown source in space, as well as the most fascinating and unexplainable. The signal's original discoverer Jerry Ehman doesn't care to speculate on its source, and he remains scientifically skeptical. "Even if it were intelligent beings sending a signal," he said in an interview, "they'd do it far more than once. We should have seen it again when we looked for it 50 times." Perhaps. But consider that when humankind used the Arecibo radio telescope to send a message out into space in 1974, it was only sent once. NOTE: Credit to a former student for finding the following article last year: In short, it has more recently been postulated that the „Wow!‟ signal may have a comet -based origin.
Image of page 50
51 Laplace Transform and Circuits Recall that we can use the Laplace Transform for circuits to: 1. Find the response of a circuit to initial conditions 2. Find the steady-state response of a circuit.
Image of page 51

Subscribe to view the full document.

Image of page 52
  • Spring '17

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes