A research team led by Dr. Sofia Sheikh of the SETI Institute, in collaboration with the Characterizing Atmospheric ...

“Any philosophy that can be put in a nutshell belongs in one,” he wrote. He is particularly famous for inventive thought experiments – one of which is about “Twin Earth”. Imagine that there is a ...

If Nemesis were still present, its gravitational pull could disrupt planetary orbits, making life on Earth impossible. Luckily, no evidence of a twin companion exists today. Scientists use ...