While the Republican-controlled House of Representatives passed a resolution Friday that keeps the government funded through Dec. 15, the measure also defunded President Obama's signature health care law — which means it has virtually no chance of passing the Democratic-controlled Senate.

If a budget resolution doesn't hit President Obama's desk before Oct. 1, that's a big problem: The government will be forced to close its doors.

With that prospect looming, here are eight things you should know about the possible shutdown: