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John Lemke

Chinese rover may freeze to death on the moon | The Verge - 0 views

  • Observers say the equipment failure may have disabled the electrical motors needed to close the rover's solar panels, which would have disastrous effects as the rover heads into the two-week "lunar night." If the panels cannot be closed, the rover will almost certainly freeze during the two week span.
John Lemke

Japanese company proposes to build solar power cells on the Moon to provide clean energ... - 0 views

  • the 11,000 mile Lunar equator
  • will beam microwave and laser energy to giant energy conversion facilities on Earth. These beams will travel to semiconductors and inverters which will convert that energy to clean electricity to the grid that will power households, businesses and factories.
  • Shimizu’s plan uses Earthly materials, ceramics, water, glass, concrete, oxygen and solar cells. They would not ship water from Earth, they will make user of the Moon’s own resources and reduce the lunar soil using hydrogen shipped from our planet and then extract the water for use in construction.
John Lemke

Is China About to Scoop the Google Lunar XPRIZE? : Discovery News - 0 views

  • A $30 million Google-backed competition to land a spacecraft on the moon may be about to be scooped. China’s Chang’e 3 probe successfully put itself into lunar orbit on Friday in preparation for an attempted touchdown around Dec. 14.
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    "A $30 million Google-backed competition to land a spacecraft on the moon may be about to be scooped. China's Chang'e 3 probe successfully put itself into lunar orbit on Friday in preparation for an attempted touchdown around Dec. 14."
John Lemke

Hubble spots water spurting from Europa : Nature News & Comment - 0 views

  • “If this pans out, it’s potentially the biggest news in the outer Solar System since the discovery of the Enceladus plume,” says Robert Pappalardo, a planetary scientist at the Jet Propulsion Laboratory in Pasadena, California, who was not involved in the research.
  • Roth’s team spotted the plumes when Europa was at its greatest distance from Jupiter. Changing stresses in the moon's crust, caused by tidal forces between the moon and planet, may explain why the researchers didn't see any plumes in the November observation when Europa and Jupiter were close. “Maybe Europa is just burping once in a while,” Pappalardo says.
John Lemke

Ask Ethan #55: Could a Manned Mission to Mars Abort? - Starts With A Bang! - Medium - 0 views

  • No humans have ever traveled farther away from Earth than the crew of Apollo 13 did, as they circled around the far side of the Moon close to lunar apogee, achieving a maximum distance of 400,171 km above the Earth’s surface on April 15, 1970. But when the first manned spaceflight to another planet occurs, that record will be shattered, and in a mere matter of days.
  • The way we currently reach other worlds with our present technology — or any remote location in the Universe — involves three distinct stages:The initial launch, which overcomes the Earth’s gravitational binding energy and starts our spacecraft off with a reasonably large (on the order of a few km/s) velocity relative to the Earth’s motion around the Sun.On-board course corrections, where very small amounts of thrust accelerate the spacecraft to its optimal trajectory.And gravity assists, where we use the gravitational properties of other planets in orbit around the Sun to change our spacecraft’s velocity, either increasing or decreasing its speed with every encounter.It’s through the combination of these three actions that we can reach any location — if we’re patient and we plan properly — with only our current rocket technology.
    • John Lemke
       
      How we can do it now, if we plan right.
  • The initial launch is a very hard part right now. It takes a tremendous amount of resources to overcome the Earth’s gravitational pull, to accelerate a significant amount of mass to the Earth’s escape velocity, and to raise it all the way up through the Earth’s atmosphere.
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  • The most optimal one for a one-way trip to Mars, for those of you wondering, that minimizes both flight time and the amount of energy needed, involves simply timing your launch right.
    • John Lemke
       
      The cheapest and the fastest. The one way ticket option.
  • When a planet orbits the Sun, there’s a lot of energy in that system, both gravitational energy and kinetic energy. When a third body interacts gravitationally as well, it can either gain some energy by stealing it from the Sun-planet system, or it can lose energy by giving it up to the Sun-planet system. The amount of energy performed by the spacecraft’s thrusters is often only 20% (or less) of the energy either gained-or-lost from the interaction!
    • John Lemke
       
      The transfer of energy involved to change speeds.
John Lemke

World's Largest Solar Array Set to Crank Out 290 Megawatts of Sunshine Power - Scientif... - 0 views

  • Agua Caliente, the largest photovoltaic solar power facility in the world, was completed last week in Arizona.
  • ive million solar panels that span the equivalent of two Central Parks in the desert between Yuma and Phoenix. It generates 290 megawatts of power—enough electricity to fuel 230,000 homes in neighboring California at peak capacity.
  • The project, which cost a total of $1.8 billion to construct, received a million-dollar loan from the Loan Programs Office. Under its “SunShot” initiative (so-named in the spirit of president John F. Kennedy’s “moon shot” program), the DoE provides guaranteed loans to unproved ventures in solar power in the hopes of promoting innovation and making the technology more cost-effective.* Although Agua Caliente (owned by U.S. energy giant NRG Energy and partner MidAmerican Solar) is now the largest photovoltaic solar facility in the world, it probably will not hold that distinction for long. Other massive solar panel facilities, such as Antelope Valley Solar Ranch One in California’s Mojave Desert, are rapidly springing up across the Southwest.
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  • The energy contained in just one hour of sunlight could power the world for a year, if only it could be harnessed.
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