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The Massive Project to Clean Up the Ocean With a Two-Kilometer Screen
$2.2 million from 38,000 people in 160 countries. The most successful non-profit crowdfunding campaign to date.
sea  earth 
yesterday by carlesbellver
Why do asteroids explode high in the atmosphere? • Bad Astronomy
Phil Plait:
<p>Computer models of how asteroids break up in the atmosphere show that the main mass must have been far weaker overall than the pieces found, by a factor of a hundred or so!

How can this be? <a href="">New research</a> indicates that the answer is, once again, air. Up until now we haven't been treating it correctly in the physics.

What was thought to happen was that the rock slams into the atmosphere and the pressure in front of it screams up. This huge force is so great it flattens the asteroid in a process literally called pancaking. The stress breaks the rock up into smaller pieces. Each piece now has more surface area, and therefore more area to slam into air and glow. They each pancake, and the process repeats, giving you a rapid cascade into disintegration and energy release. kaBOOM.

But it turns out that the computer code being used didn’t really treat how the air gets into the rock, literally finding its way at high speed and pressure into cracks and voids inside the rock. That’s where the new research comes in. Using a more sophisticated code (developed at Los Alamos National Lab to simulate air flow at high velocities), they were able to add in the asteroid material permeability to see how it changes the impact physics.

What they found is that increasing the permeability increases the amount of pancaking, which increases the efficiency of breaking up the rock.</p>

Just in case you're asked by a national leader to help decide what to do about a giant asteroid heading for the earth.
asteroid  impact  earth 
5 days ago by charlesarthur
Un big data contra el cerdismo dominguero
La única forma es decirlo en plata. Hablando de mierda.
earth  sea 
8 days ago by carlesbellver
Letter of Recommendation: iNaturalist - The New York Times

Most of us are oblivious to this winged panoply, even in our own backyards, because our perception is circumscribed by our ecological illiteracy. Learning the names of our many wild neighbors is an exercise in perspective and empathy, transforming the outdoors from a pastoral backdrop into a world of parallel societies inhabited by diverse creatures, each with its own character and career.
nature  love  apps  life  knowledge  howto  tool  opinion  earth  epistemic 
9 days ago by aries1988
APOD: 2017 December 4 - Earth and Moon
Explanation: On rare occasions, the Earth and Moon are photographed together. One of most spectacular times this occurred was 25 years ago this month when the Jupiter-bound Galileo spacecraft zoomed past our home planetary system. Then, robotic Galileo watched from about 15-times the Earth-Moon separation as our only natural satellite glided past our home world. The featured video combines 52 historic color-enhanced images. Although our Moon may appear small next to the Earth, no other planet in our Solar System has a satellite so comparable in size . The Sun, far off to the right, illuminated about half of each sphere, and shows the spinning Earth's white clouds, blue oceans, and tan continents. Tonight, a nearly full Oak supermoon will be visible from all of Earth from sunset to sunrise.
astronomy  photography  earth  moon  video  APOD 
11 days ago by rgl7194

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