sierra-nevada-mountains

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No words can describe how incredible it is to experience camping in Yosemite National Park. Sleeping under the stars and waking up to towering granite walls and tremendous raging waterfalls is something so beautiful and spectacular within itself. I can’t wait to camp here again soon.

By: Corbin Callaway

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Moonrise over lake Tahoe during the Perseid Meteor Shower, which peaked last weekend. The lights that fly across the entire screen are planes crossing the sky, but there are a few “much” shorter flashes in here that are Perseid meteors - watch it a couple times if you need to spot some.

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As you travel south from the Tahoe region you begin to see the slow change of geology take place  as the peaks increase in elevation. The peaks in the north go up to the high 9K’s but starting on the Nevada side of Tahoe you start to see the 10K peaks like MT ROSE and then moving south to Jobs peak they continue rising. These shots are from the Eastern Sierra about 100-150 miles south of Tahoe. The heights are in the 10-14K and become starkly different in overall impression. The Virginia lakes image (Frog Lakes picture 3) is at 10331FT. making the surrounding mountains in the 11-13K range. The energy and feel of hiking above 10K is very addictive and puts in the mind to only go higher and higher. The further south you go the higher it gets until you see the highest peak in the lower 48 Mt Whitney at over 14K. A truly spectacular peak to behold.

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6 hour timelapse of the Milky Way over the highest part of the Sierra Nevada Mountains. The light turns up later in the shot because the moon rises in the background - Mt. Whitney, the highest point in the continental United States, is basically at the center of the frame when it ends.

Images of Change

Our planet is constantly changing, and we use the vantage point of space to increase our understanding of Earth, improve lives and safeguard our future. 

These images show change over time, with periods ranging from centuries to years. Some of these effects are related to climate change, some are not. Some document the effects of urbanization or the ravage of natural hazards such as fires and floods. All show our planet in a state of flux. Take a look…

Urban Expansion in New Delhi, India

Between the times these two images were taken, the population of India’s capital and its suburbs (known collectively as “Delhi”) ballooned from 9.4 million to 25 million. It is now second in population only to Tokyo, which has 38 million people.

Great Salt Lake Shrinkage, Utah

Dramatic change in the area of the Great Salt Lake over the past 25 years. The lake was filled to near capacity in 1985 because feeder streams were charged with snowmelt and heavy rainfall. In contrast, the 2010 image shows the lake shriveled by drought. The Promontory Peninsula (protruding into the lake from the top) is surrounded by water on three sides in the first image, but is landlocked on its eastern side in the second.

Exceptional Early Ice Melt, Greenland

Meltwater streams, rivers and lakes form in the surface of the Greenland Ice Sheet every spring or early summer, but melting began exceptionally early in 2016. Melting encourages further melting when pods of meltwater develop, since they darken the surface and absorb more sunlight than ice does. Surface melt contributes to sea-level rise when the water runs off into the ocean.

Iran’s Lake Urmia Changes Color

Some combination of algae and bacteria is periodically turning Iran’s Lake Urmia from green to red. The change typically occurs when summer heat and dryness evaporate water, increasing the lake’s saltiness. Data from satellites indicate that the lake has lost about 70% of its surface area over the last 14 years.

Owens Lake Degradation, California

Owens Lake lies in the Owens Valley between the Sierra Nevada and the Inyo Mountains, about 130 miles north of Los Angeles, California. For thousands of years, it was one of the most important stopover sites in the western U.S. for migrating waterfowl and shore birds. However, in the early 20th century, the lower Owens River, which fed the lake, was largely diverted to the Los Angeles aqueduct. Water from springs and artesian wells kept some of the lake alive, but toxic chemicals and dust impinged on the regional environment and disturbed the bird habitat.

Baban Rafi Deforestation, Niger

Baban Rafi Forest is the most significant area of woodland in the Maradi Department of Niger, a west African country on the southern edge of the Sahara Desert. These pictures show the loss of a significant fraction of the natural landscape (darker green areas) of the forest to agriculture. Population in this region quadrupled during the 40 years leading up to the 2007 image.

Colorado River Evolution, Mexico 

These two pictures illustrate the extremes of water flow in the Colorado River since measurements began in the late 1800s. The 1985 image was taken in the midst of record high flow, while the 2007 image shows the driest period. Excessive rains or severe droughts directly change the amount of water available in the Colorado River Basin, and so does the increasing pressure of human needs throughout the western states.

Helheim Glacier Melt, Greenland

Along the margin of the Greenland Ice Sheet, outlet glaciers flow as icy rivers through fjords and out to sea. These pictures show a fjord in which Helheim Glacier (on the left) is crumbling into large and small icebergs (light blue, on the right). The glacier outlet held steady from the 1970s until about 2001, then began to retreat toward its source about 4/7 miles between 2001 and 2005. The glacier’s flow to the sea has also sped up.

Drying Lake Poopó, Bolivia

Lake Poopó, Bolivia’s second-largest lake and an important fishing resource for local communities, has dried up once again because of a drought and diversion of water sources for mining and agriculture. The last time it dried was in 1994, after which it took several years for water to return and even longer for ecosystems to recover.

Flooding on the Ganges River, India

Heavy monsoon rains have caused catastrophic flooding along the Ganges and other rivers in eastern and central India. At least 300 people died and more than six million were affected by the flooding, according to news reports. These images show a stretch of the Ganges near Patna.

All of this knowledge about our home planet enables policy makers, government agencies and other stakeholders to make informed decisions on critical issues that occur all around the world. From rising sea levels to the changing availability of freshwater, we enable studies that unravel the complexities of our planet from the highest reaches of Earth’s atmosphere to its core.

To see the full ‘Images of Change’ gallery, visit: http://climate.nasa.gov/images-of-change

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

In the heart of California’s Sierra Nevada is one of the most awe-inspiring sights: The giant sequoia groves in Sequoia and Kings Canyon National Parks. 🌲 These towering trees are some of the world’s largest (by volume). They are as tall as an average 26-story building, and their bases can exceed the width of many city streets. This amazing pic of the snow-covered General Sherman Tree covered is from the archives courtesy of Ed Cooper. 

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Raúl Esparza characters + name meanings {Part 1} ↝ insp