Moon history and its evolution
Over 150 moons orbit the solar system’s planets. And one of those moons calls Earth home. The moon formed 4.5 billion years ago when, according to one theory, the Earth slammed into another early planet. Debris began to orbit Earth and accumulated, forming today’s moon. The moon is the fifth-largest natural satellite in the solar system, with a diameter slightly below the width of China. It’s composed of an iron-rich core, plus a mantle and crust containing minerals made of magnesium, oxygen, and silicon. The moon’s surface was geologically active and covered in an ocean of magma. But now, apart from traces of water ice, the surface is totally covered in dust and rocky debris.
Countless craters dot the moon’s surface. Each created by objects such as meteoroids, comets, and asteroids crashing onto the moon. The largest crater, the South Pole Aitkin Basin, spans across a quarter of the moon’s surface and is almost deep enough to suit Everest inside. The moon orbits our planet at an average distance of about 30 Earths. It rotates at an equivalent rate that it revolves.
So, as it revolves around our planet, the same side of the moon faces the world in the least times. From the Earth’s surface, we can observe eight distinct recognized stages of the moon’s illumination, called lunar phases. They have been observed for thousands of years, and even provided the idea for the earliest calendars. For most of human history, the moon could be studied from afar. But on July 20th, 1969, humans were ready to close that distance with the American spaceflight mission Apollo 11. It placed humans on the moon for the first time. Bring our understanding of Earth’s only natural satellite one step closer.
thanks to NASA’s Lunar Reconnaissance Orbiter because now we have a great look at some of the moon’s history. the moon likely started its life as giant ball of magma, which formed from the remains of an impact on earth about four and a 1/2 billion years ago, after the hot material collected into a sphere, the magma began to cool eventually forming a crust on the surface of the Moon, with the magma just underneath about 4.3 billion years ago a giant impact bed of the moon’s the South Pole, and form the South Pole Aitken, basin and sending debris, as far as the opposite side of the moon.