Images of Edwin Hubble Discovered What edwin hubble wikipedia tiếng việt Edwin Hubble Images of Discovered What

Images of Edwin Hubble Discovered What edwin hubble wikipedia tiếng việt Edwin Hubble Images of Discovered What

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A little interesting about space life.

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

Using N-body simulations that model a recently snared Triton, and a likely primordial prograde system of moons, Dr. Rufu and Dr. Canup show that if the moons sport a mass ratio comparable to that of Uranus's system of moons or smaller, Triton's destructive dance with them has the tragic likelihood of reproducing the system that astronomers now observe. The simulations even demonstrate that the interactions decrease Triton's original semi-major axis rapidly enough to to stop smaller, outer moons like Nereid from being unceremoniously evicted from the system.



and finally

Because the lunar atmosphere is very thin, it is far too sparse to prevent a steady shower of impacts from tumbling asteroids, comets, and meteoroids. These objects strike the lunar surface, leaving behind numerous crater scars. For example, Tycho Crater is over 52 miles wide.

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Astronomers have for years contemplated two competing hypotheses explaining the origin of the Martian moons. The first proposes that Phobos and Deimos are, indeed, escapees from the Main Asteroid Belt. Alas, this viewpoint begs the question of why they should have been so cruelly captured by their adopted parent-planet in the first place. An alternative theory points to the possibility that the moons were born from the debris left by a violent collision between Mars and a primordial protoplanet--a baby planet still under construction. However, this theory also suffers from uncertainty because it does not explain precisely how this particular tragic mechanism gave rise to Phobos and Deimos.



Dozens of crewless spacecraft, including landers, rovers, and orbiters, have been dispatched to Mars by the Soviet Union, the United States, Europe, and India to observe the planet's climate, surface, and geology. Since the year 2000, cameras circling in orbit around Mars have sent back to Earth a treasure chest overflowing with revealing pictures of the "fire star." These wonderful images have displayed a Martian surface etched with small valleys and carved into slopes. These features are eerily similar in their shape to gullies carved by gushing water flowing on Earth. The Martian gullies are believed to be less than a few million years old--a tiny wink of the eye on geological time scales. In fact, some of the gullies even appear to be younger than that! These detections are enticing. This is because the observations hint to planetary scientists that great quantities of liquid water may still be lingering on Mars at present--and that this gushing water might be what carved out the gullies.



"Our model explains the diversity of these ice-rich moons and the evidence for their very active geology and dynamics. It also explains a puzzling fact about Titan, in that a giant impact would give it a high orbital eccentricity," Asphaug continued to explain to the press on October 18, 2012.