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Chasma Boreale-01.JPGChasma Boreale (2)68 visiteTapering from a width of 120 Km (75 miles) at its mouth, Chasma Boreale is only about 35 Km (22 miles) wide here. The cliffs on the Northern (top) and Eastern (right) sides of the image rise about 1400 meters (4600 feet) above the base. On the inside walls of this gigantic amphitheater are stacked layers of ice, while on its floor lie a dark sheet of what is likely frozen sand and a horde of sand dunes marching down-canyon under the winds' direction.
Chasma Boreale is so dramatic a feature that it forms part of a proposed martian "Polar Park." Yet setting aside future tourist revenues, the canyon is rewarding scientists today with glimpses into the history of the martian climate.
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Comparisons.jpgComparisons260 visiteSun - Earth: the average diameter of the Sun is about 1,392,000 km, almost 109 times larger than the Earth (12,742 km). This means that we could put 109 Earths side by side to match the diameter of our star.
Stephenson 2-18 - Sun: the largest known star compared to the Sun. We are talking about a radius of 2,158 solar radii (solar radius equals 696,340 km). If we were to place it at the centre of our Solar System, its photosphere would engulf the orbit of Saturn, the lord of the rings.
Ton 618 - Stephenson 2-18: the largest known black hole compared to the largest star. Ton 618 has a diameter of 2606 astronomical units (1 astronomical unit is equivalent to the distance Earth - Sun or 150 million kilometres). To give a better idea, Saturn (used as a comparison before) is 10 astronomical units away from the Sun.
We are ants in the Universe!MareKromium
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Criovulcanismo.jpgCryovolcanism on Earth (just like on Mars and Titan, as far as we know for now...) 479 visite...Wonders of Nature...MareKromium
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Cthulhu_and_R_lyeh.jpgCthulhu in his Kingdom: R'lyeh (Credits: Dominique Signoret)202 visiteCthulhu is a fictional creature created by American writer Howard Phillips Lovecraft.
It is a semi-divine being of prodigious proportions and strength who resides in the lost city of R'lyeh, in a deathlike slumber, awaiting a favorable astral conjunction to awaken him. In the stories of the so-called Cthulhu Mythos, also known as the Cthulhu Mythos (a posthumous definition of Lovecraft's work and additions by many other writers), the author and his followers defined it as a blasphemous deity, worshipped by degenerate, savage, and mad populations, connected to the onset of nightmares, and whose cult involves atrocious human sacrifices. Cthulhu first appears in the story "The Call of Cthulhu" (1928).
Cthulhu is part of the complex mythology created by H. P. Lovecraft, which he attributed to a fictional manuscript (pseudo-biblium) known as the Necronomicon, compiled by the "mad Arab" Abdul Alhazred. Cthulhu is the chief priest of the Great Old Ones, abominable alien creatures who settled on Earth when life on Earth was still in its infancy. He arrived on Earth with his stellar offspring (the so-called "star-spawn of Cthulhu") and founded the legendary city of R'lyeh, where he was imprisoned (whether voluntarily or involuntarily) when the stars aligned correctly ("the stars come right").MareKromium
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Eccentricity_half.pngEccentricity "half" (Highly Elliptical Orbit)119 visiteAlways for those who want to learn something, besides b.s.MareKromium
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Eccentricity_zero.pngEccentricity Zero (Almost Circular Orbit)110 visiteFor those who want to learn something...MareKromium
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Enceladus-IMG003035.jpgNot for Human Eyes... (by Karl Kofoed)81 visiteCaption NASA:"In this artist's rendering, a distant Sun forms a halo (refracted sunlight by ice crystals) amid streamers of pure water ice particles, which spew into space from cracks in the South Polar surface of Saturn's tiny moon Enceladus". MareKromium
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Enceladus-IMG003036.jpgThe Fountains of Enceladus (by Karl Kofoed)69 visiteCaption NASA:"This artist's painting of the South Polar Region of Saturn's tiny moon Enceladus shows massive jets of water ice being blasted into space. The moon's lack of atmosphere and low gravity prevents the jets from fanning out quickly as they might on a more massive world. These plumes feed the extensive E-Ring of Saturn". MareKromium
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Exo-Planet_STEEL.pngSteel: exo-planet LTT9779 b116 visitenessun commentoMareKromium
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Exoplanet.jpgExoplanet OGLE-2003-BLG-235L/MOA-2003-BLG-53L67 visiteNASA's Hubble Space Telescope has for the first time identified the parent star of a distant planet (system name OGLE-2003-BLG-235L/MOA-2003-BLG-53L) discovered in 2003 through ground-based gravitational microlensing. Gravitational microlensing occurs when a foreground star amplifies the light of a background star that momentarily aligns with it. Follow-up observations by HST in 2005 separated the light of the slightly offset foreground star from the background star. This allowed the host star to be identified as a red dwarf star located 19.000 LY away. The HST observations allow for the planet's mass and the orbit from its parent red star to be determined.
In this artist's concept, the rings and moon around the gas giant are hypothetical, but plausible, given the nature of the family of gas giant planets in our Solar System.
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Express_To_Heaven.jpgExpress to Heaven (by Roberto Tremolada)66 visitenessun commentoMareKromium
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Extreme_Overview.jpgExtreme Overview (by Roberto Tremolada)66 visitenessun commentoMareKromium
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