Scientists are racing to understand whether life on distant planets would evolve under similar patterns as Earth’s, sparking ...

This makes it hard to know what to expect from the primitive life forms that might exist on Mars or K2-18b. It's uncertain whether such life forms would resemble Earth life at all. Alien life ...

Obelisks defy categorization—lacking the protein shells of viruses yet resembling viroids, these RNA loops represent a distinct and enigmatic form of life. Obelisks could represent ancient ...