Results for: 2006

Urban Rain

Urban Rain

Most city dwellers worry about what the weather will do to their city, but for meteorologist Marshall Shepherd, the real question is what are cities doing to the weather. Read more

Paleoclimatology: Understanding the Past to Predict the Future

Paleoclimatology: Understanding the Past to Predict the Future

Scientists use complicated climate models to predict how Earth's climate might change in the future. One of the best ways to test the reliability of such models is to see how well they recreate climates of the past. Read more

Hurricanes: The Greatest Storms on Earth

Hurricanes: The Greatest Storms on Earth

Few things in nature can compare to the destructive force of a hurricane. Called the greatest storm on Earth, a hurricane is capable of annihilating coastal areas with sustained winds of 155 mph or higher and intense areas of rainfall and a storm surge. In fact, during its life cycle a hurricane can expend as much energy as 10,000 nuclear bombs! Read more

Tracking Nature's Contribution to Pollution

Tracking Nature's Contribution to Pollution

Scientists combined models and satellite data to track the spread of pollutants from forest fires in Alaska and Canada in 2004. They discovered that fires can have a significant impact on air pollution far from the fires location. Read more

Rise and Fall: Satellites Reveal Full Length of Tsunami-Generating Earthquake

Rise and Fall: Satellites Reveal Full Length of Tsunami-Generating Earthquake

Ambiguous seismic data and a spotty GPS network initially frustrated geologists mapping the length of the tsunami-generating earthquake that struck Indonesia in 2004. Caltech grad student Aron Meltzner decided to improvise: he mapped the rupture using satellite images of coral reefs and coastlines that rose or sank during the quake. Read more

Beating the Heat in the World's Big Cities

Beating the Heat in the World's Big Cities

Green roofs can mitigate urban heat islands and heat waves. Read more

Ask-A-Scientist

Ask-A-Scientist

Questions from visitors to the Earth Observatory and answers from scientists. Read more

Defying Dry: Amazon Greener in Dry Season than Wet

Defying Dry: Amazon Greener in Dry Season than Wet

Satellites reveal that the Amazon rainforest is greener during the dry season than during the wet season. Read more

Paleoclimatology: Explaining the Evidence

Paleoclimatology: Explaining the Evidence

Scientists' efforts to explain the paleoclimate evidence-not just the when and where of climate change, but the how and why-have produced some of the most significant theories of how the Earth's climate system works. Read more

Earth's Big Heat Bucket

Earth's Big Heat Bucket

The Earth now absorbs more energy than it emits back into space, and the excess heat is hiding in the ocean. Read more

Forest on the Threshold

Forest on the Threshold

NASA data reveal that Arctic forests are getting browner as temperatures rise. The downward trend in the forests' health may be a sign that global warming is impacting the forests sooner than scientists predicted. Read more

Lake Victoria's Falling Waters

Lake Victoria's Falling Waters

By early 2006, the Jason-1 satellite showed that water levels on Africa's Lake Victoria had dropped to levels not seen in decades, leaving the millions who depend on the lake high and dry. Read more

Ancient Crystals Suggest Earlier Ocean

Ancient Crystals Suggest Earlier Ocean

Tiny, ancient mineral crystals from the arid shrublands of Western Australia suggest Earth's oceans developed far earlier than scientists used to think. Read more

Winds Connect Snow to Sea

Winds Connect Snow to Sea

Explosive blooms of plant life in the Arabian Sea between 1997 and 2003 may be the result of a significant dip in snow cover thousands of miles away in Europe and Asia. Read more

Aiding Afghanistan

Aiding Afghanistan

NASA satellite data help optimize agricultural output in Afghanistan. Read more

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Satellite images showing how our world— forests, oceans, cities, even the Sun— has changed in recent decades.
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The night side of Earth twinkles with light in these composite global and regional views.
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A catalog of NASA images and animations of our home planet.
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Vital signs of the planet.
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