97997
At our current top speed of , the Helios 2 probe would arrive at the nearest star , Proxima Centauri , in around 18,000 years , much longer than a human lifespan and therefore requiring much faster transportation methods than currently available .
 Helios 2, Proxima Centauri
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Helios 2, Proxima Centauri