NASA has plenty of exciting years ahead, but it's taking the time to look back on the end of a successful and inspiring year. From commercial space development, to remaking "Gangnam Style," to successfully landing a robotic rover on Mars while the world looked on, it's an exciting time to be part of the human species. Of course, the agency will also face many challenges ahead, including its ability to get sufficient funding -- but hopefully the agency's demonstrated success will pave the way for future investment. Head to the source link to catch NASA's round-up of 2012.