Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: The entire Universe outside our galaxy could completely disappeared over 20,000 years ago and we still wouldn't know it yet.. #terrifying
This tweet contains emotions: 
fear, pessimism