Published on May 12, 2014
Patrick Stewart narrates a global spectacle that probes oceans and scales mountains to explain our planet's past and present.
What you don't know about your planet will thrill, amaze and even frighten you. The facts featured in this video are as startling
as they are fascinating. Did you know that each year an average of 18,000 meteorites hit the earth; that it's 3,000 degrees Fahrenheit
just four miles below you or that the top of Mount Everest was once part of the ocean floor? Take part in the exciting story of Earth:
scoop molten lava from an active volcano. Explore the Moon with Apollo astronauts. Be present at the world's largest subsurface exploration.
See Earth's oldest geological artifact - a 3.7 billion-year-old rock in Australia. Discover how Africa and South America split apart
millions of years ago. Witness the devastating effects of an earthquake as it happens.
Flee from deadly lightning-fast lava flows from an erupting volcano, and much more. Buckle up, you won't believe the power of this amazing earth!
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The ?Potsdam Gravity Potato? Shows Variations in Earth?s Gravity
The Earth?s gravitational model (aka the ?Potsdam Potato?) is based on data from the
LAGEOS, GRACE, and GOCE satellites and surface data. Credit: GFZ
People tend to think of gravity here on Earth as a uniform and consistent thing. Stand anywhere on the globe,
at any time of year, and you?ll feel the same downward pull of a single G. But in fact, Earth?s gravitational field is subject
to variations that occur over time. This is due to a combination of factors, such as the uneven distributions of mass in the oceans,
continents, and deep interior, as well as climate-related variables like the water balance of continents, and the melting or growing of glaciers.
NASA | Van Allen Probes Reveal Previously Undetected Radiation Belt Around Earth
Visualization of the radiation belts with confined charged particles (blue & yellow) and plasmapause boundary (blue-green surface).
Credit: NASA/Goddard
It?s a well-known fact that Earth?s ozone layer protects us from a great deal of the Sun?s ultra-violet radiation.
Were it not for this protective barrier around our planet, chances are our surface would be similar to the rugged and lifeless landscape
we observe on Mars.
Beyond this barrier lies another ? a series of shields formed by a layer of energetic charged particles that are held in place by the
Earth?s magnetic field. Known as the Van Allen radiation belts, this wall prevents the fastest, most energetic electrons from reaching Earth.
Published on Feb 28, 2013
These two nearly identical spacecraft launched in August 2012 and with only six months in operation, they may well be rewriting science textbooks.
The probes study the Van Allen belts, gigantic radiation belts surrounding Earth, which can swell dramatically in response to incoming energy from the sun,
engulfing satellites and spacecraft and creating potential threats to manned space flight.
James Van Allen discovered the radiation belts during the 1958 launch of the first successful U.S. satellite. Subsequent missions have observed parts of the belts, but what causes the dynamic variation in the region has remained something of a mystery.
This video is public domain and can be downloaded at: http://svs.gsfc.nasa.gov/goto?11212
Iridium NEXT Set to Begin Deployment This Year
by DAVID DICKINSON on JUNE 18, 2015
An artist’s conception of an Iridium-NEXT satellite in low Earth orbit. Image credit: Iridium Communications Inc.
