1u00 Add to that02u00 the serendipity of the Berkeley team viewing the same region with an optical light telescope. 02br 00How does the underlined part work in the sentence?02br 02br 00Thanks0-
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— Cool Breeze
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0 Hi LiJ02br 01i00Add02i00 is a verb (imperative), 01i00to02i00 is a preposition 01i00add02i00 requires and 01i00that02i00 is a demonstrative pronoun which refers to something mentioned previously.02br 00CB 0-