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Mars Base

Space Shuttle Endeavour Arrives at Museum Home | Space.com - 0 views

www.space.com/-endeavour-museum-arrival.html

scibyte67 shuttle

shared by Mars Base on 15 Oct 12 - No Cached
  • reached the threshold of the hangar at about 2 p.m. PDT (5:00 p.m. EDT; 2100 GMT), where it was set to enter through the building's temporarily removed rear wall
  • , Endeavour will be hoisted vertical and exhibited with a pair of solid rocket boosters and a replica external fuel tank to re-create how the space shuttle looked before liftoff.
Mars Base

Astronauts Hail Skydiver Felix Baumgartner's Record-Breaking Supersonic Jump | Space.com - 0 views

www.space.com/eaction-felix-baumgartner.html

scibyte67 RedBullStratos

shared by Mars Base on 15 Oct 12 - No Cached
  • " I didn't feel a sonic boom because I was so busy just trying to stabilize myself,"
  • went into a tough spin at the jump's beginning. "It was really a lot harder than I thought it was going to be.
  • Several NASA and ESA astronauts
  • ...1 more annotation...
  • noted that the skydiver was the fourth-highest person near Earth, beat only by the three astronauts living on the International Space Station,
Mars Base

Dawn Finds Asteroid Vesta is Rich in Hydrogen - 0 views

www.universetoday.com/...roid-vesta-is-rich-in-hydrogen

scibyte64 dawn

shared by Mars Base on 21 Sep 12 - No Cached
  • The giant asteroid Vesta appears to have
  • hydrogen
  • Dawn spacecraft reveals hydrated minerals in a wide area around Vesta’s equator
  • ...17 more annotations...
  • Dawn did not find actual water ice, there are signs of hydrated minerals such as hydroxyl
  • source of the hydrogen within Vesta’s surface appears to be hydrated minerals delivered by carbon-rich space rocks that collided with Vesta at speeds slow enough to preserve their volatile content
  • pitted terrain – looking much like potholes – mark where the volatiles, perhaps both hydroxyl and water, released from hydrated minerals boiled off
  • Hydroxyl has recently been found on the Moon in permanently shadowed craters at the lunar poles
  • scientists thought there might be a chance that water ice may have
  • around the giant asteroid’s poles
  • unlike Earth’s Moon, however, Vesta has no permanently shadowed polar regions
  • strongest signature for hydrogen actually came from regions near the equator. And there, water ice is not stable
  • The holes that were left as the water escaped stretch as much as 0.6 miles (1 kilometer) across and go down as deep as 700 feet (200 meters
  • collisions converted the hydrogen bound to the minerals into water, which evaporated
  • The pits look just like features seen on Mars, but while water was common on Mars, it was totally unexpected on Vesta in these high abundances
  • ults provide evidence that not only were hydrated materials present, but they played an important role in shaping the asteroid’s geology and the surface we see today
  • the first direct measurements describing the elemental composition of Vesta’s surface
  • elemental investigation by the instrument determined the ratios of iron to oxygen and iron to silicon in the surface materials
  • new findings solidly confirm the connection between Vesta and a class of meteorites found on Earth called the Howardite, Eucrite and Diogenite meteorites
  • have the same ratios for these elements
  • n, more volatile-rich fragments of other objects have been identified in these meteor
Mars Base

Asteroid's troughs suggest stunted planet - 0 views

phys.org/...id-troughs-stunted-planet.html

scibyte65 Vesta

shared by Mars Base on 27 Sep 12 - No Cached
  • Scientists have been trying to determine the origin of these unusual troughs since their discovery just last year
  • new analysis supports the notion that the troughs are faults that formed when a fellow asteroid smacked into Vesta's south pole. The research reinforces the claim that Vesta has a layered interior, a quality normally reserved for larger bodies, such as planets and large moons.
  • ggest of those troughs, named Divalia Fossa, surpasses the size of the Grand Canyon by spanning 465 kilometers (289 miles) long, 22 km (13.6 mi) wide and 5 km (3 mi) deep
  • ...20 more annotations...
  • The complexity of their formation can't be explained by simple collisions
  • New measurements
  • taken by NASA's Dawn spacecraft last year
  • indicate that a large collision could have created the asteroid's troughs
  • would only have been possible if the asteroid is differentiated – meaning that it has a core, mantle and crust
  • By saying it's differentiated, we're basically saying Vesta was a little planet trying to happen
  • previous research has found signs of igneous rock on Vesta, indicating that rock on Vesta's surface was once molten, a sign of differentiation
  • If the troughs are made possible by differentiation, then the cracks aren't just troughs, they're graben
  • graben is a dip in the surface that forms when two faults move apart from each other and the ground sinks into the widening gap
  • Vesta's troughs have many of the qualities of graben
  • observations indicate that Vesta is also unusually planet-like for an asteroid in that its mantle is ductile and can stretch under a lot of pressure
  • not yet fully convinced that Vesta's troughs are graben
  • There are other qualities of Vesta that could be clues to how the troughs formed
  • unlike the larger asteroid Ceres, Vesta is not classified as a dwarf planet because the large collision at its south pole knocked it out of its spherical shape
  • if Vesta has a mantle and core, that would mean it has qualities often reserved for planets, dwarf planets and moons—regardless of its shape
  • believes the south pole collision knocked Vesta into its current speedy rate of rotation about its axis of about once per 5.35 hours
  • may have caused the equator to bulge outward so far and so fast that the rotation caused the troughs, rather than the direct power of the impact
  • enigma why Vesta rotates so quickly
  • Dawn has already left to explore Ceres, so all the data it will retrieve on Vesta is in hand
  • scientists will continue to sort that data out and improve on computer simulations of Vesta's interior
Mars Base

Search for element 113 concluded at last - 0 views

phys.org/...2012-09-element.html

scibyte65 elements

shared by Mars Base on 27 Sep 12 - No Cached
  • do not occur in nature and must be produced through experiments involving nuclear reactors or particle accelerators
  • via processes of nuclear fusion or neutron absorption
  • Elements 93 to 103 were discovered by the Americans, elements 104 to 106 by the Russians and the Americans, elements 107 to 112 by the Germans, and the two most recently named elements, 114 and 116, by cooperative work of the Russians and Americans.
  • ...1 more annotation...
  • On August 12, those experiments bore fruit: zinc ions travelling at 10% the speed of light collided with a thin bismuth layer to produce a very heavy ion followed by a chain of six consecutive alpha decays identified as products of an isotope of the 113th element
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