Today marks the 50th anniversary of Dr. Martin Luther King Jr.’s famous “I Have a Dream” speech. There’s no shortage of coverage to mark the day, but we were wondering how far the original broadcast has traveled into space. We sat down and got all geared up to do some serious space-math. Here’s what we came up with.
50 light years.
That’s how far the speech traveled. Space-math turned out to be super easy in this case as soon as we realized that the radio waves carrying the broadcast travel at the speed of light. Traveling at the speed of light for 50 years puts you 50 light years away.
We were a little disappointed we didn’t get to do more complicated calculations because, well, we’re geeks. So not satisfied with an easy answer we decided to look at known places in the Universe the speech could have traveled to in that time.
In the constellation of Ara about 50 light years from Earth sits the main sequence G-type star Mu Arae, or HD 160691. Assuming the broadcast was heading in the right direction, it would just be getting there now. If you happen to be on one of Mu Arae’s three known planets maybe you could tune in.
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