Made by Matt · GROW Science
Nine substantive, dated, source-coded cards embedded in the lesson pack; no web access or account is required.
Saturn's rings contain billions of separate pieces of ice and rock. The pieces range from tiny grains to much larger chunks.
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Water ice makes up much of Saturn's bright rings. Dust and rocky material are mixed with the ice.
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Saturn's rings are many narrow ringlets, not one solid sheet. Icy pieces reflect sunlight, helping the rings look bright.
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Iron minerals in Martian rock and soil reacted with oxygen over time. The iron oxide produced is like rust and gives much of the surface a red colour.
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Fine dust rich in iron oxides covers much of Mars. Winds can lift this red dust into the thin atmosphere.
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From Earth, Mars has a red-orange appearance. Iron oxide in its surface dust is the main reason for this colour.
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Earth takes about 365.25 Earth days to orbit the Sun. Mars takes about 687 Earth days.
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Mars is farther from the Sun than Earth and its orbit takes longer. One Martian year is nearly two Earth years.
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Earth is the third planet and Mars is the fourth. A Mars year lasts about 687 Earth days, compared with about 365 days for Earth.
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| Question | Source codes compared | What agrees? | What needs checking? |
|---|---|---|---|
| What are Saturn's rings made of? | |||
| Why does Mars look red? | |||
| How long do Earth and Mars take to orbit the Sun? |
Return to lesson: W10A · Solar System Research: Evidence Desk