The earth/moon radius ratio is about 3.67/1 and the mass ratio is about 80/1.
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The ratio of Earth's diameter to the Moon's diameter is about 3.7:1, and the ratio of their masses is about 81:1.
The ratio of Earth typically refers to the ratio of its radius, diameter, or mass to that of another celestial body such as the Moon or Sun. For example, the ratio of Earth's radius to the Moon's radius is about 3.7:1.
No, Earth's moon does not have a hydrosphere. There is no evidence of liquid water on the moon's surface.
The term for the moon when the whole disc is visible from Earth is "full moon." During a full moon, the sun, Earth, and moon are aligned in a way that the illuminated side of the moon is facing the Earth.
A new moon occurs when the moon is positioned between the Earth and the Sun, with the side of the moon illuminated by the Sun facing away from Earth. This alignment causes the side of the moon we see from Earth to be in shadow, making it appear as if there is no visible moon in the night sky.
The Moon's circular motion around the Earth is due to a combination of gravitational forces between the two bodies. The gravitational pull of the Earth keeps the Moon in orbit around it, and the Moon's initial velocity prevents it from falling into Earth. This delicate balance between gravity and velocity results in the Moon's continuous circular motion.