lifeonotherplanetsFo的精選

問題詳情：Isthereintelligent(有智力的)lifeonotherplanets?Foryears,scientistssaid“no.”or“wedon’tknow.”Buttodaythisischanging.SethShostakandAlexandraBarnettareastronomers(天文學家).Theybelieveintelli...