Read the excerpt from Chapter Four of Windows to the Universe: Revolutions in Astronomy.Even before NASA launched the Hubble Space Telescope in 1990, scientists were already planning for the next generation of space telescopes.Besides including a year, which phrase provides the best clue to the text’s organization?

“Even before” signals a time relationship: the planning happened before Hubble launched in 1990. This clue shows that the passage organizes information by sequence in time. “Already planning” and “next generation” describe the scientists’ plans, but they do not signal the organization as clearly as “Even before.”

AI-written and checked against the verified answer.