Ptolemaic Solar System historical astronomy ptolemy System Solar Ptolemaic

Ptolemaic Solar System historical astronomy ptolemy System Solar Ptolemaic

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A little interesting about space life.

The people of the Moon are well aware of the barren, austere conditions and the life threatening dangers on the moon's surface. As very orderly and self-disciplined citizens or as their brains have been programmed to do so, the people of the moon always keep away from those egresses and never attempt to go out to explore the outer surface.

and here is another

Earth's Moon is the fifth largest moon in our Solar System, and the only world beyond our own that we have walked upon, leaving our footprints behind in moon dust as a silent testimony that once we existed, and had been there. Our Moon is both the brightest and largest object in Earth's night sky, and many astronomers think that our bewitching lunar companion was born as a result of an ancient collision between our planet and an ill-fated Mars-sized protoplanet that has been named Theia. There are other theories that have been devised to explain our Moon's origin, but the Giant Impact theory is considered to be the best explanation. When the doomed Theia blasted into the primordial Earth, it launched into the sky above our planet the debris resulting from that catastrophic crash. The debris eventually coalesced into Earth's Moon.

and finally

The Giant-Impact Theory, alternatively termed the Theia Impact, or Big Splash Theory, proposes that Earth's Moon was born from the debris remaining from a catastrophic collision, that occurred about 4.3 billion years ago, between the primordial Earth and an unfortunate protoplanet, that was about the size of Mars. The Earth's Moon-forming collision would have occurred when our Solar System was still forming during the Hadean eon. The Hadean eon occurred about 20 to 100 million years after our Solar System emerged from its frigid, dark natal cloud of gas and dust. The doomed impacting protoplanet, often called Theia, received its name in honor of a Titan in Greek mythology who was the mother of Selene, the Moon goddess. An analysis of lunar rocks, published in 2016, indicates that this catastrophic crash was a direct hit--causing a thorough mixing of both Earth-stuff and Theia-stuff. The Giant-Impact Theory is the favored scientific explanation for the birth of Earth's Moon.

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The first observations of Mars as an object traveling in Earth's night sky was recorded by the ancient Egyptian astronomers, and by 1534 BCE the ancient astronomers were familiar with the retrograde movement of the planet. By the time of the Neo-Babylonian Empire, the Babylonian astronomers were making regular records of the positions of the planets, as well as systematic detections of their behavior. In the case of Mars, the ancient astronomers realized that it made 42 circuits of the zodiac every 79 years. These scientists of long ago even invented arithmetic methods so that they could make minor corrections pertaining to the predicted positions of the planets inhabiting our Solar System. The ancient astronomers referred to the planets as "wandering stars".

The researchers continued to explain that their scenario makes strong predictions for how the tortured, misty large moon Titan formed, what the icy mid-sized moons are made of, and how they began as rapidly spinning lumps of ice-laden material. The little moons could provide valuable clues that reveal to planetary scientists what happened in this mysterious outer region of our Solar System--as well as when it happened.

The Apollo 11's lunar module, Eagle, landed on the surface of the moon on the 20th of July, 1969. It landed at approximately 20:17:40 UTC. An interesting fact is that the Eagle had barely enough fuel left for 25 seconds more, as the two men had encountered some difficulties during landing due to their training at NASA. Things were quite a bit different in reality and the several alarms that were going off certainly didn't help to calm the already likely nerve-wracking maneuver.