Chemical fingerprints could belong to a signature of life on distant planet

This week, learn why experts are divided over an exoplanet, see the first footage of a colossal squid in its deep-sea habitat, uncover why Earth is peeling, and more.

​ This week, learn why experts are divided over an exoplanet, see the first footage of a colossal squid in its deep-sea habitat, uncover why Earth is peeling, and more. Read More Breaking News, Latest News and Videos | CNN