Earth's magnetosphere. Credit: ESA The part of a planet`s magnetosphere that is elongated away from the Sun by the solar wind. Earth`s magnetosphere extends about 65,000 km on the dayside but more than 10 times further (beyond the Moon`s orbit) on the nightside. Jupiter`s magnetotail extends be... Found on http://www.daviddarling.info/encyclopedia/M/magnetotail.html