The phrase "a small moon that" is correct and usable in written English.
It can be used when describing a specific small moon and providing additional information about it.
Example: "The astronomers discovered a small moon that orbits the distant planet, revealing new insights into its formation."
Alternatives: "a tiny moon which" or "a little moon that".
A small moon that circles Saturn harbours a warm water ocean beneath its thick icy crust, according to research that makes the distant body a prime target in the search for life elsewhere.
In the "Star Wars" film series, the Death Star was a space station about the size of a small moon that was equipped with laser weapons powerful enough to destroy planets.
Americans are petitioning the White House to go where it has never gone before -- to construct a "Death Star" by 2016 to "strengthen our national defense". In the "Star Wars" film series, the Death Star was a space station about the size of a small moon that was equipped with laser weapons powerful enough to destroy planets.
Still, he might want to keep an eye out for any small moons that appear to be hovering over his studio.
There may be other small moons that behave in this manner, as well, but it is difficult to measure the rotational periods of small moons around distant planets, so we don't know of any yet.
Cassini images taken in 2008 revealed the presence in the G ring of a small moon, named Aegaeon, that is about 0.5 km (0.3 mile) across.
They liken the situation to the one at dwarf planet Pluto which has a small moon called Charon that was also probably the result of a collision.
They are two small moons that orbit Mars.
The new view allows Cassini mission scientists to better study the shifting motions and intricacies of Saturn's rings, as well as the small moons that shape the rings.
An astronomer has discovered a small moon of the planet Uranus that was captured on photos by the probe Voyager 2 (see below) but overlooked for more than 13 years.
One possible explanation is that a small moon had crashed into Himalia and the force of the impact caused material to blast off Himalia.
