Right now, it's cold in the Arctic. Days are dark, and ice grows to cover the dark sea. Come summer, lengthening days and warming temperatures will reverse that process. This is the ebb and flow of the Arctic, a natural cycle.
However, over the past several decades we have seen summers melt more and more of the ice that forms during the cold winter months. As a result, more and more dark seawater is exposed to the light of day.
NASA researchers, using several instruments on three separate satellites, has been collecting data for 15 years to find out why the ice is melting, and to be able to predict trends in future ice formation and melting. They reported on this data at the 2014 American Geophysical Union annual meeting, saying that 15 years worth is the absolute minimum amount of information needed for them to begin making long-term predictions. Climate trends, as opposed to weather trends, are averaged over 30 years, so they are about halfway there at this point in time.
The project to observe the Arctic is part of NASA's Clouds and the Earths Radiant Energy Systems (CERES) mission. They measure the Earth's reflected solar radiation, emitted thermal infrared radiation, and all emitted and reflected radiation.
The results so far indicate that the Arctic is absorbing energy from the sun five percent faster now during the summer months than it was when they first began monitoring in 2000. This is important because the rest of the Earth is still absorbing energy at pretty much the same rate. Read the rest
The first space-bound Orion capsule has arrived at a NASA Kennedy Space Center launch pad. Read the rest
In this spectacular image released this week, an older galaxy ignites with an outer ring of stellar life.
A new study of satellite data by scientists at NASA and University of Michigan One shows that one small “hot spot” in the American Southwest produces the greatest concentration of the greenhouse gas methane in the United States.
The US space agency today revealed plans for a new rover: Mars 2020.
The rover "will carry seven carefully-selected instruments to conduct unprecedented science and exploration technology investigations on the Red Planet," NASA announced.
Designing, launching, and landing a rover that can withstand the rigors of space travel and the brutal challenges of the Red Planet's surface is no big deal for JPL engineers. But how they'll pull it off by 2020 with the currently projected federal space budget is anyone's guess.
May we suggest Kickstarter?
From the official press release:
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NASA announced the selected Mars 2020 rover instruments Thursday at the agency's headquarters in Washington. Managers made the selections out of 58 proposals received in January from researchers and engineers worldwide. Proposals received were twice the usual number submitted for instrument competitions in the recent past. This is an indicator of the extraordinary interest by the science community in the exploration of the Mars. The selected proposals have a total value of approximately $130 million for development of the instruments.
The Mars 2020 mission will be based on the design of the highly successful Mars Science Laboratory rover, Curiosity, which landed almost two years ago, and currently is operating on Mars. The new rover will carry more sophisticated, upgraded hardware and new instruments to conduct geological assessments of the rover's landing site, determine the potential habitability of the environment, and directly search for signs of ancient Martian life.
"Today we take another important step on our journey to Mars," said NASA Administrator Charles Bolden.” While getting to and landing on Mars is hard, Curiosity was an iconic example of how our robotic scientific explorers are paving the way for humans to pioneer Mars and beyond.
The NASA Opportunity Mars rover landed on Mars ten years ago, and was not expected to be trucking along in the dust an entire decade later. But truck along it has, and NASA this week announced that Opportunity now "holds the off-Earth roving distance record after accruing 25 miles (40 kilometers) of driving." The previous record was held by the Soviet Union's Lunokhod 2 rover.
"Opportunity has driven farther than any other wheeled vehicle on another world," said Mars Exploration Rover Project Manager John Callas, of NASA's Jet Propulsion Laboratory in Pasadena, California. "This is so remarkable considering Opportunity was intended to drive about one kilometer and was never designed for distance. But what is really important is not how many miles the rover has racked up, but how much exploration and discovery we have accomplished over that distance."
A drive of 157 feet (48 meters) on July 27 put Opportunity's total odometry at 25.01 miles (40.25 kilometers). This month's driving brought the rover southward along the western rim of Endeavour Crater. The rover had driven more than 20 miles (32 kilometers) before arriving at Endeavour Crater in 2011, where it has examined outcrops on the crater's rim containing clay and sulfate-bearing minerals. The sites are yielding evidence of ancient environments with less acidic water than those examined at Opportunity's landing site.
More at NASA JPL website.
This week, NASA beamed a high-def video from the International Space Station to Earth, a distance of 260 miles, using a new laser communications instrument. The "Hello, World!" video was the first video message transmitted from space to earth using Optical Payload for Lasercomm Science (OPALS), "a technology demonstration that allows NASA to test methods for communication with future spacecraft using higher bandwidth than radio waves."
More about the video transmission, and the system it uses:
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"The International Space Station is a test bed for a host of technologies that are helping us increase our knowledge of how we operate in space and enable us to explore even farther into the solar system," said Sam Scimemi, International Space Station division director at NASA Headquarters in Washington. "Using the space station to investigate ways we can improve communication rates with spacecraft beyond low-Earth orbit is another example of how the orbital complex serves as a stepping stone to human deep space exploration."
Optical communication tools like OPALS use focused laser energy to reach data rates between 10 and 1,000 times higher than current space communications, which rely on radio portions of the electromagnetic spectrum.
Because the space station orbits Earth at 17,500 mph, transmitting data from the space station to Earth requires extremely precise targeting. The process can be equated to a person aiming a laser pointer at the end of a human hair 30 feet away and keeping it there while walking.
To achieve this extreme precision during Thursday’s demonstration, OPALS locked onto a laser beacon emitted by the Optical Communications Telescope Laboratory ground station at the Table Mountain Observatory in Wrightwood, California, and began to modulate the beam from its 2.5-watt, 1,550-nanometer laser to transmit the video.
Washington Post: "A sweeping review of NASA’s human spaceflight program has concluded that the agency has an unsustainable and unsafe strategy that will prevent the United States from achieving a human landing on Mars in the foreseeable future. The 286-page National Research Council report, the culmination of an 18-month, $3.2 million investigation mandated by Congress, says that to continue on the present course under budgets that don’t keep pace with inflation 'is to invite failure, disillusionment, and the loss of the longstanding international perception that human spaceflight is something the United States does best.'”
The report bolsters the case for manned missions to the moon, which President Obama oppose. “I just have to say pretty bluntly here: We’ve been there before,” the president said in a space policy speech in 2010. Read the rest
In the 1960s and 1970s, NASA astronauts spent time training in the moon-like volcanic landscape of Hawaii's Big Island; the Pacific International Space Center for Exploration Systems dug out fantastic photos from NASA's archives (thanks, Bob Pescovitz!).