It would be astounding if alien life had terrestrial DNA. A lot of scifi movies get this hopelessly wrong. It's reasonable to expect some kind of DNA-analog: a

It would be astounding if alien life had terrestrial DNA. A lot of scifi movies get this hopelessly wrong. It's reasonable to expect some kind of DNA-analog: a system, not necessarily using familiar amino acids, that does a similar job. We live in a relatively cold and squishy regime. I suspect the range of possible DNA-analogs is much wider than we think it is. Many will exist in not-at-all-Earth-like conditions.