Solar System Exoplanets Map habitable planet reality check epic 201912552b drew ex Map Solar System Exoplanets

Solar System Exoplanets Map habitable planet reality check epic 201912552b drew ex Map Solar System Exoplanets

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It is important to know at any age!

Poor Pluto was discovered by the American Clyde Tombaugh in 1930, and it was appropriately named after the ancient Roman god of the underworld, shrouded as it is in the perpetual darkness of our Solar System's distant deep freeze. Charon was discovered in 1978 by the astronomer James Christy, also an American.

and here is another

When the astronomers measured variations in the light reflected off Nix and Hydra, they obtained the first clues of the Pluto system's chaos. When studying images obtained from HST between 2005 and 2012, the astronomers were surprised to find that the brightness changed unpredictably, rather than following a regular cycle. This weird discovery could only be explained by chaotic movement.

and finally

Most of the moons dwelling in our Sun's family were probably born from primordial disks of dust and gas, orbiting around newly formed planets, when our Solar System was very young about 4.5 billion years ago. There are at least 150 moons circling the planets in our Solar System--and about 25 moons are currently awaiting official confirmation of their discovery.

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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.

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".

By studying how the four inner planets evolved and grew--using more than 250 computer simulations--the planetary scientists discovered that if the Moon-birthing blast had happened early, the quantity of material accreted onto Earth afterward would be enormous. If the impact had occurred late, the amount of material would be relatively small.

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