Final answer:
The sentences can be combined with appositives to read: 'Cassie, who received her telescope for her birthday, views the constellation Aquarius with it.'
Step-by-step explanation:
To combine the three sentences and add appositives and/or appositive phrases, you can say: Cassie, who received her telescope for her birthday, views the constellation Aquarius with it.. In this sentence, the appositive phrase 'who received the telescope for her birthday' provides additional information about Cassie. By adding this phrase, the three sentences are combined into one sentence.
In this combined sentence, 'who received her telescope for her birthday' is an appositive phrase that gives additional information about Cassie, and 'Aquarius' is an appositive that provides more information about the constellation.