To do often.

(cosmology, astrobiology, astronomy) An era of a Big Bang based universe with the physical laws of our Universe, where the cosmic microwave background is energetic enough to heat water into a liquid state, making all bodies beyond the inner limit of the habitable zone possible in hosting liquid water regardless of the amount of insolation provided by the local star.

A usual way to think of something; a mindset

A usual way to think of something; a mindset

(medicine) A chronic cough that has no underlying organic cause or medical diagnosis, and does not respond to conventional medical treatment.

plural of habit cough

(idiomatic) Established habits are difficult to change.

plural of galactic habitable zone

(astrobiology, astronomy) the restricted zone around a sun where the ever shifting habitable zone is always present throughout the main sequence lifetime of that star.

plural of continuously habitable zone