Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture 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