The Australian alternative to chavs. Self-important little twits who listen to bands like Limp Biskit and Papa Roach because they think they're hardcore. Try to go out on dates because they're trying to act all adult, but it all ends s of poorly because their middle-class parents, after giving them lot money, notice that their 8-12 yearold kids are too young and put an immediate stop to it.
Bogan youth are the offspring of dumb christian yuppies however, not bogans. The offspring of bogans are little shits.

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.