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It is important to know at any age!
All the cities conduct ceremonial functions to welcome incoming visitors and to bid farewell to the outgoing visitors. As everybody either leaves a city or reaches a new city on a particular fixed day, these ceremonies are held at predetermined venues. As the logistics stand, this ceremonial function repeats on every fourteenth day in every city center. The day long ceremonies create good meeting opportunities for the people.
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In order to spot such a remote exomoon, the authors of this new study, The Hunt for Exomoons with Kepler (HEK): III. The First Search for an Exomoon around a Habitable-Zone Planet, used a technique that models the dips and features of the parent star's light-curve (stellar brightness vs. time), which are caused by transits of the planet (and any accompanying moons) in front of the face of its star. This is a complicated and difficult endeavor because numerous and diverse models of planet-moon dynamics must be taken into consideration. Each one of these models possesses parameters that describe physical properties belonging to the planet or moon, as well as parameters describing the orbital system. The authors use what is termed Bayesian statistics to account for the fact that the true orbital model of this planetary system is still not known--and this enables them to calculate if a model with our without a moon fits the observed light-curve the best.
Saturn, along with its frozen retinue of icy rings, dazzling moons, and sparkling moonlets, orbits our Sun about ten times farther out than the Earth. Astronomers received their first collection of detailed data about Titan when the Cassini/Huygens orbiter and lander arrived there in 2004. The Huygens lander successfully obtained revealing images when it drifted down to Titan's tormented, hydrocarbon-slashed surface, as well as when it was still floating slowly and softly down through the moon's thick, foggy, orange atmosphere--which has 1.4 times greater pressure than that of our own planet. These pictures, when combined with other studies using instruments aboard the Cassini orbiter, reveal to curious planetary scientists that Titan's geological features include lakes and river channels filled with methane, ethane, and propane. Titan's strange surface also shows mountains and sand dunes--and it is pockmarked by craters. The rippling dunes form when fierce winds sweep up loose particles from the surface and then tosses them downwind. However, the sands of Titan are not like the sands on our Earth. Titan's "sand" is both bizarre and alien, probably composed of very small particles of solid hydrocarbons--or, possibly, ice imprisoned within hydrocarbons--with a density of about one-third that of the sand on our own planet. Furthermore, Titan's gravity is low. In fact, it is only approximately one-seventh that of Earth. This means that, working in combination with the low density of Titan's sand particles, they carry only the small weight of a mere four percent that of terrestrial sand. Titan's "sand" is about the same light-weight as freeze-dried grains of coffee!
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Mysterious and enticing--a true Wonderland world--Mars has sung its scientific siren's song for years to those who seek to understand its many long-held secrets. This small, rocky world with an intriguing red hue, gets its rusty color from the large amount of iron oxide that coats its surface. Much of this small world's charm comes from its reputation of being the happy abode of "little green men"--Earth's neighboring planet that plays host to life as we know it. However, Mars has many captivating features and bewitching mysteries, in addition to the somewhat dated idea that it is the most likely world in our Solar System--other than our Earth--to host living creatures. The duo of small potato-shaped Martian moons, Phobos and Deimos, are frequently considered to be captured asteroids that the Red Planet's gravity snared when they were making an ancient and unfortunate journey through interplanetary space from their place of birth in the Main Asteroid Belt, located between the orbits of Mars and Jupiter. The duo of rocky objects now circle their adopted parent-planet--at least, for the time being. However, in July 2016, a team of astronomers proposed an alternative viewpoint, suggesting that the two little moons were born from an ancient impact on the Martian surface by a crashing primordial object--along with many other now long-lost little moons.
The more recently obtained data concerning the Red Planet comes from seven active probes that either roam the Martian surface or orbit around the planet. The seven spacecraft include a quintet of orbiters and a duo of rovers. This collection includes 2001 Mars Odyssey, Mars Express, Mars Reconnaissance Orbiter, MAVEN, Mars Orbiter Mission, Opportunity, and Curiosity.
If you were to take an Apollo 11 quiz in school, you would likely find that one of the main focuses is the fact that it was the first mission to carry humans to the moon. It was on this voyage that the famous words, "That's one small step for man; one giant leap for mankind," were uttered by Neil Armstrong as he became the first human being to ever set foot on the moon.