Chen looks out at bedtime: dark sky, many stars. In morning: bright sky, no stars. Which is true?
- Stars are visible at night but not visible in daytime. (correct answer)
- Stars are visible only when the sun is up.
- Stars are not visible at night in the dark sky.
- Stars show up only on one special day each week.
Explanation: This question tests the 1st grade skill of describing when stars can be seen in the sky - at night versus during the day (1-ESS1-1: Use observations of stars to describe patterns that can be predicted). Stars are visible in the sky at nighttime when it is dark, but they are not visible during the daytime when the sky is bright and sunny. This pattern is predictable and happens every day: when the sun goes down and it gets dark (nighttime), we can see many stars in the sky; when the sun comes up and it gets bright (daytime), we cannot see stars anymore. The stars are always there, but the bright sunlight during the day makes them impossible to see, while the dark night sky lets us see their light. In this observation, Chen looks out at bedtime with a dark sky and many stars, and in the morning with a bright sky and no stars. The observation clearly shows stars visible at bedtime in the dark but not in the morning light. Choice A is correct because it accurately states stars are visible at night but not visible in daytime. This matches the observations that Chen saw stars in the dark sky at bedtime but not in the bright morning sky. Choice B reflects daytime visibility claim. This error typically occurs when students confuse different sky objects (moon/stars/sun), don't yet distinguish what's visible vs what exists, think bright sky might show stars better, haven't observed pattern multiple times, confuse conditions for visibility. To help students understand: Observe and draw the sky at daytime and nighttime; look for stars at nighttime (with adult) and note you cannot see them during day; discuss how both skies are 'real' but show different things; use picture comparisons; keep a simple chart for several days marking 'day: no stars visible, night: many stars visible.' Watch for: students who think stars don't exist during the day (they're there, just not visible), who expect to see stars during daytime if they look hard enough, who confuse stars with other sky objects like moon, or who think pattern is random rather than predictable every day/night.