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Planet Mercury

Across
A ______ day on Mercury is equivalent to 58 Earth days.
making a certain situation or outcome likely or possible.
The most abundant gas/element in Mercury's exosphere.
of, on, or relating to the earth.
Mercury's core is primarily made of this element.
The closest planet to the Sun.
Mercury has a cometary ______.
Mercury is the second most _______ planet, next to the Earth.
Down
Mercury is the ________ planet in the Solar system.
the outermost region of a planet's atmosphere.
A ______ day on Mercury, lasts 175 Earth days
If Mercury had an atmosphere it would be even _______.
having large bowl-shaped cavities in the surface
Mercury's ________ is the shortest in the solar system. (88 days)
Mercury's _____ is only 2 degrees!