change to indirect:
the teacher said, "sun is a star".
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Answer:
Tʜᴇ Tᴇᴀᴄʜᴇʀ sᴀɪᴅ ᴛʜᴀᴛ Sᴜɴ ɪs ᴀ sᴛᴀʀ.
Here the tense won't change as it is a universal truth!