As a general rule, U.S. citizens can travel outside the country for up to 6 months before needing to return. However, it's important to check specific visa requirements and entry rules for the country you are visiting, as they may have different time limits for stays.
It has to travel around the whole of the world first before making its next return and it is slow.
A person may still travel to any country as long as the passport is not expired. How long before it expires is not taken into account unless the passport expires before the traveler is expected to return.
In general, you can leave the U.S. and return on the same day without any specific time requirement. However, if you stay outside the U.S. for more than 180 days, you may face issues when trying to re-enter. It's important to check your specific visa requirements and any travel restrictions before leaving the country.
You can travel immediately after acquiring a passport.
a WEEK
depending on where they live usually 1-5km and return
Well answer depends on when or how fast after applying for green card your travel plan is. Depending on the seriousness and urgency of your visit the decision to travel must be taken. Maybe going outside US will not be a problem but entering becomes a problem.
Unfortunately, it is not possible for one to travel the cosmos outside of science fiction. Many advances in technology have been made in the past half century, making it possible to travel into space and soon as a space tourist as well, but it will be a long time before one can travel beyond the nearest planets in the Solar System.
as long as you return within those 90 days!
It takes approximately three weeks to return to work after an adult tonsillectomy.
Certain countries require that there be a minimum time left on your passport before you can enter the country (eg 3 years to expiry) As these are generally countries ther require a visa to enter, the information should be given to you by the travel agent or particular embassy. But I don't think you can travel if your passport will expire before your return date unless you're an EU Citizen within an EU state because then there are ways to get a new one from home.
In "theory ", yes - but you'd never live long enough to actually do it.