自从探索外太空的航天器第一次升空,美国科学家便注意到不能将地球外病毒传给地球,当然也不能把地球病毒带到外太空。美国航天局(NASA)所有发射到其他星球的航天器都必须经过严密的审查程序,以确保它们没有将地球上的生物带到其他行星。返航时也是如此,因为NASA更不希望看到航天器带回任何外星球的物质。毕竟谁 Since the spacecraft was first explored, scientists in the United States have noticed that it is impossible to transmit the virus outside Earth to the Earth and certainly can not bring the Earth virus to outer space. All NASA spacecraft that launch on other planets must undergo a rigorous censorship process to ensure they do not take living creatures on Earth to other planets. This is also the case for homecoming because NASA does not even want to see the spacecraft bring back any extraterrestrial material. After all