Gliese 581c facts

While investigating facts about Gliese 581c, I found out little known, but curios details like:

Earth has sent out a radio signal towards a possible life-containing exoplanet named Gliese 581c. It is supposed to reach the planet by late 2029.

A high-powered radio signal containing 501 messages called 'A Message From Earth' was sent in 2008 toward Gliese 581c and has travelled over 60 trillion kilometres and is expected to be delivered by 2029

In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across. Here are 2 of the best facts about Gliese 581c I managed to collect.