How Astronomers Know — Evidence Lab
Day and Night Model
- Estimated time
- ~10 min
Saved locally on this device
Learning goals
- Day and night happen because Earth spins on its axis. The side of Earth facing the Sun has day; the other side has night.
- 5-ESS1-2 — Students analyze daily patterns in shadow, day/night and sky.
Help & glossary
- Use the hint ladder before checking your answer — hints get more specific.
- Incorrect answers can be retried. Feedback explains why.
- Constructed responses (CER) are self-checked — nothing is sent to a server.
Question 1 of 2
What causes day and night on Earth?
Sources
- Day, Night, and the Seasons — NASA/JPL Education — NASA/JPL · NASA/JPL-Caltech · Accessed 2026-09-01