Dinousaur Asteroid Earth Collision why it was an asteroid smashing into earth that wiped out Dinousaur Earth Asteroid Collision

Dinousaur Asteroid Earth Collision why it was an asteroid smashing into earth that wiped out Dinousaur Earth Asteroid Collision

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Interesting facts about space.

However, Neptune is wacky. This giant gaseous world has only a small number of moons when compared to the other three gaseous giant planets in our Sun's outer realm: Jupiter, Saturn, and Uranus. Of the quartet of giant planets that inhabit our Sun's outer kingdom, Jupiter and Saturn are classified as gas-giants, while Uranus and Neptune are ice-giants. While all four planets are enormous in size, Jupiter and Saturn are much larger than Uranus and Neptune, and possess much more massive gaseous envelopes. The ice-giants, Uranus and Neptune, are smaller, contain larger solid cores, and sport less massive gaseous envelopes than their two gas-giant planet kin.



and here is another

The name moon jellyfish is purely descriptive. They are named for the most prominent part of their anatomical makeup, their large disk or full moon shaped bell. They can be further distinguished by the four horseshoe-shaped gonads at the center of their bell. These reproductive organs resemble the craters found on the moon. These fish are very popular as pets because they are transparent and will appear to glow in whatever color is shined through them. They look particularly stunning in an aquarium with an LED fader system set up in it. Another point in their favor is that their stinging cells do not produce enough pressure to pierce human skin. In the wild, a moon jelly's life cycle is limited to one year form start to finish. In captivity they can easily live up to three years. These jellies can grow up to one foot in diameter.



and finally

The vanished, ill-fated, large moon could have been a few hundred kilometers in diameter. The large moon would also have allowed a handful of other smaller moons to form--including the duo of small, shapeless ones that survive today. However, this large inner moon would have been born close to or within the Roche limit. This is why it is likely that it crashed into Mars as a result of tidal forces within several million years--and the collection of other small moons followed their leader. Only Phobos and Deimos kept their distance.

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In 2010 and 2011, the French astrophysicists devised their model to explain how the moons of Saturn were born. They based their findings on data derived from the Cassini probe--that is investigating the Saturn-system--and on numerical simulations. The team found that Saturn's bewitching rings, which are slender disks composed of tiny chunks of gleaming ice surrounding the giant planet, gave rise to the icy moons. This happened because the rings spread as time went by--and when the rings attained a critical distance from the planet (termed the Roche limit), their ends melded together and created small worldlets that broke off and floated away. In this way the rings created the icy moons orbiting Saturn.



Saturn has 62 known moons. Most of them are very small, icy worldlets. On June 11, 2004, shortly before arriving at Saturn, the Cassini spacecraft made its only flyby--at an altitude of 2,000 kilometers--past the very tiny icy moon Phoebe. Phoebe is a heavily cratered worldlet that circles its planet backwards--indicating that it is a captured object, born elsewhere, and not an original member of Saturn's family.



Such moon-forming mergers and collisions are not unheard of. For example, the leading theory explaining the formation of Earth's own large Moon, suggests that it was born about 4.5 billion years ago when a Mars-sized protoplanet, dubbed Theia by astronomers, collided with our planet. Just as our Moon is identical geologically to Earth's mantle, the six medium-sized icy sister moons of Saturn are all similar in composition to Titan's icy mantle, the researchers announced in October 2012.