Scanning electron microscope image of Ramazzottius varieornatus | Kazuharu Arakawa and Hiroki Higashiyama

DNA Analysis Reveals Why ‘Water Bears’ Are the World’s Toughest Animal

Tardigrades are virtually indestructible, and scientists believe alien life could share some of the same qualities as these tiny creatures.

Muscles of the tardigrade H. dujardini labeled with a fluorescent stain. Each muscle is a single cell. | Habib Maroon, University of Edinburgh
Underside of a tardigrade, showing its claws. | Habib Maroon, University of Edinburgh