While it is quite difficult to lose permanent residency status, it is possible to have your green card lapse. This is because while permanent resident status is permanent, your US green card is not. You can simply visit the USCIS website to fill out a green card renewal application.
Consequently, can I travel out of the country with a green card?
Even though you are now a U.S. resident, you will need to bring your foreign passport when traveling, for purposes of entering other countries. You will, in fact, be expected to present your valid, unexpired green card upon reentry to the United States. (This is also known as a Permanent Resident Card or Form I-551.)
How long can you be out of the country as a US citizen?
A permanent resident card is not a valid entry document when the resident is abroad for 365 days or longer. That's why a person who plans to be abroad for one year or longer should apply for a U.S. Citizenship and Immigration Services advanced parole document before leaving.
Can a green card be revoked upon divorce?
If you obtained your green card through marriage to a U.S. citizen or permanent resident, a divorce (or annulment) may pose a problem. However, it's true that, since USCIS is always on the lookout for fraudulent marriages, a divorce may cause USCIS to take a second look at your case.