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The spacecraft Voyager 2 flew past Uranus in 1986, and Neptune in 1989. Voyager 2 sent back images of Neptune to Earth that revealed a strikingly beautiful deep blue planet, that sported stripes and bands, and spot-like storms akin to hurricanes. Neptune's bands and spots are different shades of blue--and these lovely shades of blue are caused by atmospheric methane, not oxygen. Some of Neptune's frothy storms are white, and look like whirling marshmallows.
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The new study is based on data gathered by Cassini's radar instrument during flybys of Titan between 2007 and 2015.
Moons are natural satellites that orbit another body that, in turn, circles its parent-star. A moon is held in place by both its own gravity and the gravitational grip of its host planet. Some planets have moons; some do not. Several asteroids in our Solar System also are orbited by very small moons--and some dwarf planets, such as Pluto, also have moons. One of Pluto's five moons, Charon, is almost 50% the size of Pluto. For this reason, the two frozen worlds inhabiting our Solar System's remote twilight zone, are sometimes classified as a double-planet.
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Over the passage of billions of years, this ceaseless rain of falling objects have pulverized the lunar surface, creating fragments ranging in size from a fine powder to enormous, heavy boulders. Almost the entire lunar surface is literally blanketed by a pile of ground up rubble composed of charcoal gray, powdery dust and rocky debris collectively termed the lunar regolith. Beneath the regolith there is a region composed of shattered bedrock that is called the megaregolith.
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.
Dr. Jacobson believes that this new study showing a later lunar birthday means that our planet's impact history was more turbulent than earlier thought. The alteration in Earth's bombardment rate, he suggests, also means an alteration in the quantity of energy that went into our planet's oceans and atmosphere. It also has implications for the history of our planet's surface temperature--which is important because liquid water could not exist until the surface had cooled off sufficiently.