Hellenistic Culture Astronomy hellenistic age Hellenistic Culture Astronomy

Hellenistic Culture Astronomy hellenistic age Hellenistic Culture Astronomy

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A little interesting about space life.

The existence of ample amounts of hydrogen in the subsurface ocean of Enceladus indicates that microbes--if any exist there--could use it to obtain energy by mixing with carbon dioxide dissolved in water. This particular chemical reaction, termed methanogenesis, because it manufactures methane as a byproduct, may have been of critical importance in the emergence of life on our planet.



and here is another

Therefore, even though Enceladus is only Saturn's sixth-largest moon, it is amazingly active. Because of the success of the Cassini mission, scientists now know that geysers spew watery jets hundreds of kilometers out into Space, originating from what may well be a vast subsurface sea. These jets, which erupt from fissures in the little moon's icy shell, whisper a siren's song to bewitched astronomers. This is because the jets suggest that the icy moon may harbor a zone where life might have evolved. The jets dramatically spray water ice from numerous fissures near the south pole, that have been playfully termed "tiger stripes." The "tiger stripes" look like giant scratches made by a tiger's raking claws.



and finally

The team's findings can also be applied to exoplanets, which are planets that circle stars beyond our own Sun. Some super-Earth exoplanets, which are rocky planets more massive than our own, have been proposed as "water worlds" covered with churning oceans. Could they have life? Perhaps. The potential would certainly be there. Dr. Vance and his team believe laboratory experiments and more sophisticated modeling of exotic oceans might help to find answers to these very profound questions.

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Comets are really traveling relic icy planetesimals, the remnants of what was once a vast population of ancient objects that contributed to the construction of the quartet of giant, gaseous planets of the outer Solar System: Jupiter, Saturn, Uranus, and Neptune. Alternatively, the asteroids--that primarily inhabit the region between Mars and Jupiter termed the Main Asteroid Belt--are the leftover rocky and metallic planetesimals that bumped into one another and then merged together to form the four rocky and metallic inner planets: Mercury, Venus, Earth, and Mars. Planetesimals of both the rocky and icy kind blasted into one another in the cosmic "shooting gallery" that was our young Solar System. These colliding objects also merged together to create ever larger and larger bodies--from pebble size, to boulder size, to mountain size--and, finally, to planet size.



When one thinks of Italy they think of picturesque countryside, ancient ruins, incredible history, scrumptious food, style and elegance. They do not often think about the very practical and functional original Moon Boot. In actual fact, Tecnica first designed Moon Boots in the early seventies and the fact that they still remain in production today is testament to the valued niche they have in the market.



In September 2015, a team of astronomers released their study showing that they have detected regions on the far side of the Moon--called the lunar highlands--that may bear the scars of this ancient heavy bombardment. This vicious attack, conducted primarily by an invading army of small asteroids, smashed and shattered the lunar upper crust, leaving behind scarred regions that were as porous and fractured as they could be. The astronomers found that later impacts, crashing down onto the already heavily battered regions caused by earlier bombarding asteroids, had an opposite effect on these porous regions. Indeed, the later impacts actually sealed up the cracks and decreased porosity.