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Lesson

Solar System

Explore the planets and distinguish day and night, seasons, Moon phases, and eclipses.

30min lesson

Objectives3 goals Lesson6 blocks Review11 assets Practice40 items

Learning objectives

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3 goals

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Name the planets in order and compare major groups of objects.
Explain rotation, revolution, and the role of Earth's tilt in seasons.
Distinguish Moon phases from solar and lunar eclipses.

Lesson

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6 sections

Concept

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The Solar System includes the Sun and the objects that orbit it. The Sun is a star that gives out its own light. The eight planets, from the Sun outwards, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The four inner planets are rocky. Jupiter and Saturn are gas giants; Uranus and Neptune are ice giants. All four giant planets have rings, with Saturn's especially prominent. Rotation means spinning on an axis. Earth rotates in about 24 hours, bringing places into daylight and then night. Revolution means travelling around another body. Earth takes about 365¼ days to orbit the Sun. Its axis is tilted by about 23.5 degrees from upright relative to its orbit. As Earth orbits, this tilt changes daylight length and sunlight angle in each hemisphere, producing seasons. The Moon reflects sunlight. As it orbits Earth, we see different amounts of its sunlit half. These appearances are phases: new moon, crescent, quarter, gibbous, and full moon, followed by the decreasing phases. A quarter moon looks half lit. Ordinary phases are not caused by Earth's shadow.

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Earth, Environment, and Sky

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Solar System

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Solar System

What to understand

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Earth, Environment, and Sky

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