> Hopefully, they can decode it.
There is a fair amount of debate regarding whether or not this would actually be a good thing, for example Stephen Hawking doesn't think so: http://news.bbc.co.uk/2/hi/uk_news/8642558.stm
There is a fair amount of debate regarding whether or not this would actually be a good thing, for example Stephen Hawking doesn't think so: http://news.bbc.co.uk/2/hi/uk_news/8642558.stm
There's also a good chance that by the time a race can travel between interstellar space, they'll be mature enough not to kill everything they see.
What makes you think that? Humans just put 1 ton hover over another planet yet we still kill each other over which parts of which iron age books we think are more than just stories.
What we do know is that within a populous of a given scientific advancement its possible for there to be a massive variation of individual and group morality as well as individual education level (particularly in regards to science). We know this because it's our current world.
Based on the reality we know about it isn't terribly apparent to me that just because some population has achieved a given level of scientific advancement that some of them won't gleefully steal my lunch.
So any interstellar race is likely to be very competitive. You hope it doesn't show up as killing, but the reality is when you have two people who both want something, they fight.
If you see an ant on the sidewalk when you're walking down the street, you don't stop to communicate with it, or teach it how to build a television. The theory goes that a civilization with the ability to travel through interstellar space would have a similar knowledge gap to us as we do to ants.
Granted, you also don't stop to ask it if you can build a house on top of its ant hill, so I suppose the analogy works both ways.
The universe operates on a time scale incredibly more significant than that, and so it's conceivable that there are intelligent beings that have been around for millions of years. Their technology and the form that they take would likely be so far beyond what we know that a similar gap in evolution would be entirely plausible.