चांद पर पहुंचने के बाद सिर्फ 14 तक ही क्यों काम कर सकेगा रोवर प्रज्ञान? समझें

According to the lastest information coming from ISRO, rover Pragyan and freely moving on the surface of moon. And will work for next 14 days. But the question here is why it will stop after 14 days? Watch