Moon is the Natural Satellite of Earth

The correct answer is option 'A', which states that the moon is the natural satellite of Earth. Let's understand why the moon is considered a natural satellite of Earth.

What is a satellite?
A satellite is an object that orbits around a larger celestial body due to the force of gravity. Satellites can be natural or artificial. Natural satellites are those that occur naturally in space, whereas artificial satellites are man-made objects that are launched into space for various purposes like communication, weather forecasting, scientific research, etc.

Explanation:
The moon is considered a natural satellite of Earth because it meets the criteria of being a celestial body that orbits around a larger body due to the force of gravity. Here are some key points to support this explanation:

1. Orbit around Earth: The moon orbits around the Earth in an elliptical path. It completes one orbit in about 27.3 days. This orbit is maintained due to the gravitational attraction between the Earth and the moon.

2. Natural Origin: The moon is believed to have formed about 4.5 billion years ago as a result of a giant impact between Earth and a Mars-sized object. This collision caused debris to be ejected into space, which eventually came together and formed the moon.

3. Size and Mass: The moon is much smaller and less massive than Earth. It has a diameter of about 3,474 kilometers, which is about one-fourth the size of Earth. Its mass is around 1/80th of Earth's mass.

4. Gravity: The moon has its own gravitational pull, although much weaker than Earth's gravity. This gravitational force affects the tides on Earth and also keeps the moon in its orbit around the Earth.

5. Physical Features: The moon has various physical features like craters, mountains, and plains. It lacks an atmosphere and water bodies, making it different from Earth.

Conclusion:
In conclusion, the moon is considered a natural satellite of Earth because it orbits around the Earth due to the force of gravity. It is a celestial body that formed naturally and has distinct characteristics. Its presence has significant effects on Earth, including the tides.