تعريف major planet في الإنجليزية الإنجليزية القاموس.
Any of the 8 celestial bodies which orbit the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune
Any planet that is significantly larger and more massive than Earth, containing large amounts of hydrogen and helium, such as Jupiter and Neptune.http: //www.seasky.org/astronomy/astronomy_glossary.html