Source: Ellie Okamoto
Photography by Mauro Maione. Full moon viewed from the Town Hall building in Siena, Italy.
Overview of Schiaparelli’s entry, descent and landing sequence on Mars, with approximate time, altitude and speed of key events indicated.
Schiaparelli is scheduled to separate from TGO on 16 October 2016, three days before arriving at Mars. Twelve hours after separation, the TGO will perform a course correction to avoid entering the atmosphere, and will continue into Mars orbit. Then, on 19 October, Schiaparelli will enter the atmosphere at an altitude of about 121 km and a speed of nearly 21 000 km/h. In the three to four minutes that follow, it will be slowed by the increasing atmospheric drag, with the front shield of the aeroshell bearing the brunt of the heating.
This will slowly melt and vaporise, allowing the absorbed heat to be carried away from the rest of the spacecraft. Once the speed has decreased to around 1700 km/h Schiaparelli will be 11 km above the surface and a parachute will be deployed. The parachute canopy will unfurl in less than a second, and, 40 seconds later, allowing for oscillations to die down, the front shield of the aeroshell will be jettisoned. The parachute will slow Schiaparelli to around 250 km/h, and then the back half of the aeroshell, with the parachute attached to it, will also be jettisoned. It will be drawn rapidly away from Schiaparelli, which will now be completely free of the aeroshell that had kept it safe en route to Mars. Schiaparelli will then activate its three hydrazine thrusters to control its speed. Radar will continuously measure the height above the surface.
At an altitude of around 2 m, Schiaparelli will briefly hover before cutting its thrusters, leaving it to free fall. The touchdown speed will be a few metres per second, with the impact absorbed by a crushable structure similar to the crumple zone in a car, on the underside of the lander, preventing damage to the rest of the module. The entire entry, descent and landing sequence will be complete in less than six minutes.
Source: European Space Agency
Artist’s concept of the Bigelow Expandable Activity Module (BEAM), currently scheduled to be added to the International Space Station in 2015.
Artist concept of the Bigelow space station.
Astronauts aboard the International Space Station are going to be getting an addition in the near future, and in the form of an inflatable room no less. The Bigelow Expandable Activity Module (BEAM) is the first privately-built space habitat that will added to the ISS, and it will be transported into orbit aboard a Space X Falcon 9 rocket sometime next year.
Gulfstream is using EBACE to demonstrate its efforts in biofuels, flying both the G450 and G550 from the company’s Savannah, Ga. headquarters to Geneva International Airport using renewable fuels.
“In 2011, the G450 was the first business jet to cross the Atlantic using biofuels,” said Gulfstream president Mark Burns. “The G450 and G550 flights to Geneva are the first transatlantic flights made using our own renewable fuel supply and mark an important milestone in our mission to practice sustainability.” Gulfstream signed a three-year agreement with World Fuel Services last year for a consistent supply of renewable fuels for its flight operations in Savannah. AltAir produces the fuel, a blend of low-carbon renewable fuel and jet-A that Gulfstream said can cut greenhouse gas emissions by more than half.
In addition to the G450 and G550, the entire Gulfstream demonstrator fleet has now flown using renewable fuels, as has the G500 flight-test fleet. Gulfstream’s supply of low-carbon, drop-in replacement biofuel is derived from agricultural waste and is certified to meet the same industry specifications as petroleum-based jet-A.
No es casualidad que desde tiempos ancestrales, la práctica del yoga haya sido considerada como una fuente de beneficios físicos y psíquicos de elevada incidencia. En tiempos recientes, es elevado el número de estudios científicos que ponen de manifiesto los beneficios de la práctica del yoga sobre nuestra salud.
De hecho, la práctica del yoga está altamente recomendada por los sistemas sanitarios más avanzados del mundo, como una alternativa natural a la conservación del bienestar y la salud. No olvidemos que al fin y al cabo los estudios científicosmás avanzados interconectan la salud biofísica con los estados conscientes de bienestar emocional.
No cabe duda que en el ámbito de la denominada epigenética, ya se cuentan por miles los estudios que sugieren esta interelación y es precisamente esta circunstancia la que hace que cada vez más la ciencia profundice sobre los beneficios del yoga y sus efectos sobre determinados aspectos de…
Ver la entrada original 1.507 palabras más
Publicado en Sin categoría | Leave a Comment »