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A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

ScienceOne small ahaSpace object

This icy Galilean moon, the second outward from Jupiter, is a major target in the search for a subsurface ocean.

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ScienceOne small aha
Your new ahaEuropa

Europa's icy surface is crossed by long fractures and ridges. Source: Europa (moon) ↗

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More from Solar System & Beyond

A few more worth knowing.

  1. 05The Moon's changing phases · explain why its apparent illuminated shape changes through the monthRECALL
    As the Moon orbits Earth, we see different fractions of its sunlit half.

    Ordinary lunar phases are not caused by Earth's shadow. That shadow is involved in a lunar eclipse.

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  2. 06Solar eclipse · relative positions of the Sun, Earth and MoonRECALL
    The Moon passes between Earth and the Sun

    Its shadow falls on Earth

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  3. 07Lunar eclipse · relative positions of the Sun, Earth and MoonRECALL
    Earth passes between the Sun and the Moon

    Earth's shadow falls on the Moon

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