惑星の表面はほとんどが水から出来ている。の英語

The surface of a planet is composed mostly of water.

a planet having a compact rocky surface like the Earth's

It is thought, based on the planet's distance from its star, that liquid water could exist on the planet.

Mercury is the closest planet to the sun.

Mercury is the nearest planet to the sun.

Mercury is the planet nearest to the sun.

Mercury is the planet nearest the Sun.

Mercury is the planet closest to the Sun.

These planets are a little bigger than the earth.

It is the first confirmation that water, essential for life, exists on a planet other than Earth.

The earth is different from the other planets in that it has water.

Asteroids are thought to remain close to the state of the planets at their formation.

Six of the planets are believed to be rocky like the Earth.

the region of interplanetary space between Mars and Jupiter where most asteroids are found

Planets move around a fixed star.

At least three of the planets are thought to have the right temperature for liquid water to exist.

between or among planets

the planets orbiting nearby are Venus and Mars

The distance between the planets and Gliese 667C is such that the temperature on the planets is in the right range for water to exist in liquid form.

a small planet and the farthest known planet from the sun

large meteorites actually come from the asteroid belt

Gas-giants don't have solid surfaces.

a strong current of air, called planetary wave

Mercury and Venus are inferior planets

an indistinct surface feature of Mars once thought to be a system of channels

If it is seen from a spaceship, the earth looks blue.

The Earth, Mars and Jupiter are planets.

Earth, Mars and Jupiter are planets.

On the surface of the moon and Mars there are countless craters, both big and small.

Jupiter is a big planet, right?