NASA is celebrating the Martian new year today. They tweeted an image saying, "Happy Mars New Year." A year on Mars last for 687 Earth days and the new year occurs around every 2 Earth years. This is timed on the Mars to Northern Hemisphere Spring Equinox. This is the month when that equinox will occur.
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An official statement from NASA states, "NASA will land in Mars, Pennsylvania Friday, June 19 to celebrate Mars' New Year with Red Planet enthusiasts of the Keystone State for three days of Science, Technology, Engineering, Arts and Mathematics (STEAM) activities. The goal is to encourage young people to pursue careers in these critical fields of study that will enable NASA's journey to Mars."
The distance of Mars from Sun is more than that of the Earth, and hence it takes significantly longer time to complete its one orbit. On this occasion, NASA is reviewing the work that has been carried on Mars, and it's remarkable difference from the Earth.
The NASA's Curiosity rover landed on Mars in August 2012. This car-sized rover started a surface mission which was initially supposed to last one Martian, but the rover is still rolling along. The explorations of the Curiosity rover on Mars are now reaching the foothills of Mount Sharp and will continue to move ahead as the journey continues.