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Interesting facts about space.
Kepler-22b, with its radius almost two and a half times that of Earth, is too large to be considered a true Earth-analog. Nevertheless, if it possesses an Earth-sized moon, the planetary system could still host a habitable world like our own.
and here is another
Triton and Pluto share roughly the same bulk composition and density, as well as similar atmospheres. In addition, both remote bodies move in unusual orbits. Pluto has a highly eccentric orbit, and is sometimes closer to the Sun than Neptune! Furthermore, Pluto orbits in the opposite direction around our Sun than do the eight major planets of our Solar System. Triton revolves around Neptune in a direction counter to that of its planet--and its retrograde orbit indicates that it is a captured object. Because of the unusual nature of both Triton's and Pluto's orbits, as well as the similarities of their bulk properties and atmospheres, it has long been thought that there is some sort of historical connection between them. Indeed, it was once thought that Pluto was an escaped moon of Neptune, but this is now considered unlikely. It is much more likely that long ago Triton, like Pluto, circled the Sun independently, but was unluckily captured by its adoptive planet--whereas Pluto was left to wander freely.
Although Theia made the ultimate sacrifice, it did not die in vain because this unfortunate world's demise made life possible on Earth. Earth's Moon makes our planet livable; it moderates Earth's wobble on its axis, resulting in a relatively stable, life-sustaining climate, and it also causes ocean tides that create a rhythm that has guided humanity for thousands of years.
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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.
The astronomer Tycho Brahe, during the 17th century, measured the diurnal parallax of Mars that Johannes Kepler had used in order to make a preliminary calculation of the relative distance to the Red Planet. When the earliest telescopes to be used for astronomical purposes finally became available, the diurnal parallax of Mars was measured again in an attempt to determine the distance between our Sun and Earth. Giovanni Domenico Cassini was the first to make this measurement in 1692--but the early parallax measurements were hindered by the primitive quality of the instruments. The only occultation of Mars by the planet Venus was observed on October 13, 1590, by Michael Maestlin at Heidelberg. In 1610, Mars was viewed by the great astronomer Galileo Galilei, who was the first to make use of a primitive telescope for astronomical purposes. The Dutch astronomer Christiaan Huygens was the first to draw a map of Mars that showed terrain features.
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.