Lunar eclipse · relative positions of the Sun, Earth and Moon

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ScienceOne small aha

Your new ahaEarth passes between the Sun and the Moon

Most of the solar system's mass is concentrated in the Sun. Source: Solar System ↗

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08This synchronized rotation and orbit keeps the same side of the Moon facing Earth.RECALL
Tidal locking
Its rotation and orbit have matching periods
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09This moon is the most volcanically active.RECALL
Io
It orbits Jupiter
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10This icy Saturnian moon shoots plumes from its south polar region, fed by a subsurface ocean.RECALL
Enceladus
It orbits Saturn
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