Sending astronauts to Mars is one thing - but getting them back home is the real challenge. NASA has developed an ambitious plan to return astronauts safely using new propulsion systems ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

为了完成让火星大气层升温的第一步，人们提出了许多建议，从在极冠上散布低反照率材料或植物（萨根，1973 年）到在大气中填充氯氟化碳（CFCs）（洛夫洛克/阿勒比，1984 年）、氨或甲烷等不一而足。还有人建议通过在本地或从其他星球（金星是一大候选者）采集二氧化碳并将其添加至火星大气中。不过建议都需要投入大量资源和目前尚未出现的全新技术。