The mass of the Earth and the Moon are similar when compared to the other planets in the solar system, so the Earth and Moon could be said to be companion planets.
(The mass of the Earth and the Moon; are; similar; T:when compared to the other planets in the solar system) (the Earth and Moon; could be said; ) (the Earth and Moon; to be; companion planets)
The mass of the Earth and the Moon the Earth and Moon the Earth and Moon
are could be said to be
similar T:when compared to the other planets in the solar system
companion planets