News tagged with northern hemisphere

Atmospheric carbon levels nearing historic threshold

(Phys.org) —For the first time in human history, concentrations of the greenhouse gas carbon dioxide (CO2) could rise above 400 parts per million (ppm) for sustained lengths of time throughout much of the Northern Hemisphere ...

dateApr 24, 2013 in Environment
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Earth's orbit around the sun

Ever since the 16th century when Nicolaus Copernicus demonstrated that the Earth revolved around in the Sun, scientists have worked tirelessly to understand the relationship in mathematical terms. If this ...

dateNov 24, 2014 in Space Exploration
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Saturn's north polar hexagon

(Phys.org)—Saturn's north polar hexagon basks in the Sun's light now that spring has come to the northern hemisphere. Many smaller storms dot the north polar region and Saturn's signature rings, which appear ...

dateFeb 26, 2013 in Space Exploration
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Climate change threatens permafrost in soil

In the coming century, permafrost in polar regions and alpine forests in the Northern Hemisphere may thaw rapidly, potentially releasing carbon and nitrogen that could cause additional regional warming. Permafrost occurs ...

dateSep 20, 2012 in Environment
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CubeSats launched from the space station

Five tiny CubeSats were deployed from the International Space Station on Thursday and astronaut Chris Hadfield called the image above "surreal" on Twitter. And rightly so, as they look like a cross between ...

dateOct 08, 2012 in Space Exploration
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Scientist turn focus to Titan

(Phys.org)—Humanity has landed a rover on Mars. Now, say scientists, it's time to land a boat on Titan. This outlandish scenario could become reality, according to engineers presenting their proposals at ...

dateSep 28, 2012 in Space Exploration
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Tackling an Ice Age mystery

In the northern hemisphere, ice sheets ebb and flow in 100,000-year cycles, driven by varying amounts of sunlight falling on Earth's surface as its orbit and orientation toward the sun changes. But astronomical variations ...

dateSep 05, 2013 in Earth Sciences
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Cormorants cannot capture the benefits of global warming

(Phys.org)—Even though cormorants seem ideally placed to benefit from global warming, by expanding their breeding range into the far north, the darkness of the polar night is likely to keep them firmly in their place, according ...

dateFeb 05, 2013 in Ecology
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