Conspiracy theorists are claiming that the two shiny spots on Ceres seen in photos taken by NASA's Dawn spacecraft are either ice or salt patches.
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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.
Put into energetic terms, this means each square meter of the Arctic Ocean is absorbing approximately 10 more watts of solar energy than everywhere else. Interestingly, this is not uniform, and is regionally specific. For instance, the Beaufort Sea has been measured at 50 watts per square meter.
All this extra energy has an impact on sea ice melt. The Beaufort Sea is one of the more dramatic ice melt examples. And, the rate of ice loss in September in the Arctic overall is 13 percent per decade. Let me spell that out... the Arctic is absorbing more energy, the air temperature is warming, and the rate of ice melting is being multiplied over ten times each decade.
So, why is this happening? It partially has to do with albedo, or reflectivity. Ice and snow reflect the sun's light and energy, while dark oceans absorb it. Less summer ice means that things are going to warm up faster, creating a feed-forward cycle that will potentially lead to even further warming and melting.
Walt Meier discussed differences in the ice itself that contribute to this process. He said that young ice melts more easily than old ice due to surface features and salinity. This results in much more rapid melting each year, which exposes more old, thicker ice to the suns rays. Each year more old ice is lost only to be replaced during the winter with easily melting young ice. The Arctic has lost 1.4 million square kilometers of ice over the past 15 years.
Young, thin ice makes the Arctic more vulnerable to further summer melting. Further Jennifer Kay, said that cloud cover is not related to the observed absorbed radiation.
Go, Orion! NASA set to launch spacecraft on first step toward manned flights to Mars [Update:
The first space-bound Orion capsule has arrived at a NASA Kennedy Space Center launch pad. Read the rest
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The launch of an Orbital Sciences Antares rocket on Tuesday for an International Space Station resupply mission ended in a dramatic explosion, and many questions remain unanswered. NASA has formed an Accident Investigation Board to gather and review data, photos, and videos of the event, to determine what went wrong. Two of the most widely-viewed publicly available videos are shared here-- one shot by a general aviation pilot who was flying near the Wallops Island launch site, and another by space and aviation journalist Stephen Young of SpaceFlight Now. Read the rest
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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.
How extreme and widespread is the California drought? Images recently released by NASA' Gravity Recovery and Climate Experiment, or GRACE, show an ever-worsening situation. Read the rest
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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:
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. Mars exploration will be this generation’s legacy, and the Mars 2020 rover will be another critical step on humans' journey to the Red Planet.
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.