Blog
Longer explainers on questions people ask. Each one uses public-domain photographs, lists its sources at the end, and links into the wiki for the details.
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What Causes the Seasons? Earth's Tilt, Not Its Distance
Seasons come from Earth's roughly 23.4-degree axial tilt, not from how far Earth is from the Sun. Sunlight angle and day length explain the rest.
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Why Leaves Change Color in Autumn
Chlorophyll breaks down and reveals yellow and orange pigments that were in the leaf all summer. Red comes from a separate pigment. Night length sets the timing.
The wiki has articles on many related subjects. To find more, browse the categories or search the wiki.