Path: csiph.com!goblin3!goblin.stu.neva.ru!news.netfront.net!.POSTED.108.219.229.47!not-for-mail From: The Starmaker Newsgroups: rec.arts.sf.written,sci.physics,sci.physics.relativity,alt.astronomy Subject: Re: Does Intelligent Life Exist On Earth? Date: Fri, 16 Mar 2018 14:53:50 -0700 Organization: Netfront http://www.netfront.net/ Message-ID: <5AAC3CEE.48EA@ix.netcom.com> References: <5AAB611D.47AB@ix.netcom.com> Reply-To: starmaker@ix.netcom.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Info: adenine.netfront.net; posting-host="108.219.229.47"; logging-data="4779"; mail-complaints-to="news@netfront.net" X-Mailer: Mozilla 3.04Gold (WinNT; U) X-Antivirus: Avast (VPS 180316-4, 03/16/2018), Outbound message X-Antivirus-Status: Clean Xref: csiph.com rec.arts.sf.written:488631 sci.physics:676716 sci.physics.relativity:452931 alt.astronomy:297494 Keith Stein wrote: > > On 16/03/2018 06:15, The Starmaker wrote: > > > See what they say. > > Let us, for the sake of argument, assume that i am on a galaxy which is > 10,000,000,000 light years from the earth. By a bit of good > planning i have my laser with me and i shine this laser at you for a > whole year. The front of this laser beam will take exactly > 10,000,000,000 to reach you here on Earth (hopefully you will still be > alive eh!). The rear end of my laser signal will take slightly longer to > reach you because the speed of light has decreased in the year i've been > holding this laser. If light decreases by my suggestion of one part in > 10 billion per year, the rear end of the signal will take exactly > 10,000,000,001 years to reach you here on Earth. > > Thus the light beam from my laser is stretch by a factor of 2 ( because > the end of the beam left 1 year after the start, and took 1 year longer > on the journey.). However the number of waves sent will be exactly the > same as the number received, (assuming you are careful and don't miss > any,) so the wavelength must also have been stretched by a factor of 2. > This is equivalent to a red-shift of 1, and corresponds reasonably well > with what is found in practice, in our observatories. > > Talking Rock eh! A cut-and-paste Rock no doubt... https://groups.google.com/forum/#!original/sci.physics.relativity/XoY9WEeRZLw/TCaNR4MSBgAJ