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The outer planets are gas planets
Heat for all the planets and the main reason for the orbits of the planets.
They don't have solid surfaces.
Both moons and planets are most likely made rock(Giving an exception to the gas giants.), and travel around an object of greater mass than itself. They both can have craters, mountains, valleys, and pretty much any other land form. The main difference is that planets revolve around a star, while moons revolve around a planet.
I suppose you might say that the main reason is they're incredibly far away! We haven't even gotten to other planets yet, and you're wondering about galaxies? The nearest other galaxies are so far away it takes even light 150,000 years to get there!
The main reason for this is that similar working day schedules around the world.
They did not want to travel long distance.
The main reason for the revolution of the Earth around the Sun is the gravitational force of the Sun.
The main force that keeps planets in orbit around the Sun is gravity. The gravitational pull from the Sun keeps the planets moving in their elliptical paths. This force of gravity is what maintains the balance needed for a planet to stay in orbit.
The main Asteroid Belt.
No, humans have not landed on any planets besides Earth. The main reason is the extreme distances and conditions of other planets in our solar system, such as harsh temperatures, lack of breathable atmosphere, and intense radiation. Sending manned missions to other planets would require significant advancements in technology and resources.
all planets when moving Gravity and inertia.