The trio are funding a £76million project called Breakthrough Listen to try and find signals or messages from extra terrestrials.
They are looking to see if there are any signals coming from Proxima B, a rocky planet dubbed Earth 2.0.
The planet is four light years away from earth (25,000,000,000,000 miles away, but quite close compared to much of the universe) and is believed to have the right conditions for life to exist.
Yuri Milner told MailOnline: ‘It came only a few months after Stephen Hawking and I, with Mark Zuckerberg’s support, launched our Breakthrough Starshot project, which aims to launch a tiny spacecraft to Alpha Centauri within a generation.
Life is like a penny, you can spend it on what you like, but you can ONLY spend it once.