The top to-do-list items for Hubble were to measure the expansion rate of the universe. (Here TO-DO-LIST means)
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Question context
This question is part of 💬 Verbal Reasoning within the broader 🧠 Aptitude Mastery subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.