Other scientists are however not so certain the discovery of alien life in space will involve advanced civilisations.
Dr Ellen Stofan, former NASA chief and head of the Smithsonian’s Air and Space Museum in Washington DC, for instance, believes scientists will find evidence of microbial life one day.
Speaking before a US Senate Subcommittee on Space, Science and Competitiveness, Dr Stofan argued planets like Mars could be home to alien microbes.
The scientist said: “Life rose here on Earth rapidly once conditions stabilised, so you know, for the first several hundred million years on Earth the conditions were probably hostile.
READ MORE: Ex-NASA chief drops THIS major Mars bombshell