Stealth Guys Night Out. Derived from the term GNO (Guy's or Girl's Night Out). This term is used when a secret GNO is planned to hide the event from a participant's significant other. Commonly used when too many GNOs have occurred in a short period of time.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

Stealth Guys Night Out. Derived from the term GNO (Guy's or Girl's Night Out GNO). This term is used when a secret GNO is planned to hide the event from a participant's significant other. Commonly used when too many GNOs have occurred in a short period of time.