Extra Terrestrial Civilization

Questions: 1.Is it possible for an extra-terrestrial civilization having a SETI project that is similar to ours to detect signals from the earth?2.How do people know if the signal is a message? How do they understand the message?3.Will the alien senders know that we are receiving their signal?4.Discuss the advantages and disadvantages of using the transit method for detecting planets. Provide an example for each. Answers: 1. The electronic signals from the earth can only travel at the speed of light. Thus, the reach of our signal is roughly 100 light years in radius, with the earth at the center of the sphere. Also, Frank and Sullivan (2016) argues that at some point the signal from the earth would degrade to a level that an extra-terrestrial civilization at a similar technology to ours would not be able to distinguish between background noises and our signal. Moreover, Griffiths, (2016) argues that despite the fact that the magnitude of our Radio signal is strong enough to be detected beyond the cosmic background radiation, there is a problem with locating the signal in the first place because cosmic background radiation is everywhere and other radio sources are stronger than ours. Thus, it is possible for other extra-terrestrial civilization with similar technology to ours to detect signals from the earth. However, scientist argues that there is no intelligent life similar to ours because there are no potential places for it to thrive. 2. According to Brabaw (2016) communication with extra-terrestrial civilization (CETI) is a branch of SETI that deals with transmission and reception of messages between alien civilization and our world. Scientists have been trying to detect signals from alien civilization since the 1960s with no success (Mosher, 2016). Thus, this makes it hard to determine a framework that can be used to decipher the message once received. 3. It is hard to realize if a signal sent in space has been received because there are many signals in space. However, if there were a direct communication line where the message can be replied, the alien senders can know their message has been received (Hall, 2016). 4. Advantages It is effective and sensitive; this is because it has already detected thousands, planetary candidates. It can provide valuable information about the detected planet because it can deduce the size of a planet from the degree of the dims during transit. Transit Photometry can operate on different scales because it can surpass all other methods in the number of planets detected ("Transit Photometry," 2016). Disadvantages It is entirely dependent of transit that is for a planet to be detected it must travel between its start and the earth. It produces falls positive that is, a star can be mistaken for a planet orbiting a star ("Transit Photometry," 2016). References Brabaw, K. (2016). Hubble Telescope Captures Sharpest Image yet of Mysterious Red Rectangle. Space.com. Retrieved 26 January 2017, from https://www.space.com/32655-mysterious-red-rectangle-hubble-telescope-sharpest-image.html Frank, A. Sullivan, W. (2016). A New Empirical Constraint on the Prevalence of Technological Species in the Universe. Astrobiology, 16(5), 359-362. https://dx.doi.org/10.1089/ast.2015.1418 Griffiths, J. (2016). Can you hear me now? 'Strong signal' from star sparks alien speculation. CNN. Retrieved 26 January 2017, from https://edition.cnn.com/2016/08/30/health/seti-signal-hd-164595-alien-civilization/ Hall, S. (2016). Mysterious SETI signal sends alien-hunting telescopes scrambling. New Scientist. Retrieved 26 January 2017, from https://www.newscientist.com/article/2102970-mysterious-seti-signal-sends-alien-hunting-telescopes-scrambling/ Mosher, D. (2016). Astronomers have detected an 'interesting' and possibly alien radio signal coming from a sun-like star. Business Insider. Retrieved 26 January 2017, from https://www.businessinsider.com/alien-signal-seti-hd164595-2016-8 Transit Photometry. (2016). Planetary.org. Retrieved 26 January 2017, from https://www.planetary.org/explore/space-topics/exoplanets/transit-photometry.html