No almost every planet has a moon. Several planets have more than one moon.
As there is only one Solar System - ours, it's difficult to comment on the other four.
not in ours
The Sun is the center of ours
ABOUT 40,000 km from the Earthit surrounds the earth.
Yes, there are several.
The moon is unusually large in proportion to Earth at just over a quarter its diameter. While several moons in the solar system are larger than ours, they orbit much larger planets.
No one knows how many planets are in our nearest solar system, Alpha Centauri.
the difference between our solar system and the scientists is that we put terrestrial and gas giants where as they only put planets. Do u guys know any other ones?
Jupiter
The other galaxies around ours and their contents.
Most solar systems have one star, like ours does. Some have two stars, known as a binary system.
Some people say that the our moons sister is the sun, but there are more moons then just ours... obviously. But some people say that all of the moons (including ours) are sisters and the sun is there "big" sister.