<unk> <unk> <unk> <unk> <unk>  Passage: A prominence forms over time scales of about a day and may persist in the corona for several weeks or months, looping hundreds of thousands of miles into space. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️  Question: What are scientists researching?
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