Scratchpad

Scratchpad r13 (See the current copy)

How Big Is Mars?

Mars, with a diameter of about 6800 kilometers., is a little more than half the size of Earth. If Earth was the size of a cricket ball, Mars would be about the size of a golf ball.

    -- http://www.lessonplanspage.com/more/205mar.html

The Moon's diameter is 3,474 km.

    -- http://en.wikipedia.org/wiki/Moon

The average diameter of the reference spheroid [of the earth] is about 12,742 km.

    -- http://en.wikipedia.org/wiki/Earth

Difference between Mars and Moon: 3326km

Difference between Mars and Earth: 5942km