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Incredible “EPIC” View Of The Moon Passing In Front Of The Earth

This is real, folks. It is not a computer-generated animation. NASA’s DSCOVR (Deep Space Climate Observatory) satellite took these incredible shots on July 16 using its Earth-facing EPIC camera from its vantage point between the Earth and the Sun, a million miles away!

DSCOVR sits at what’s known as the L1 Lagrangian point, where the gravitational pull of the Earth and Sun balance out in such a way that satellites positioned there can remain in stable orbit while using minimal energy:

Image: NASA/NOAA

This view of the far side of the Moon reminds us that it is anything but dark. The Moon is tidally locked, meaning that we see the same face all the time, but the sun regularly shines on the side that we don’t see (we’re just seeing a new or crescent moon when that happens). The far side also lacks the dark plains, or maria, that texture the Earth-facing side, made of basalt laid down by ancient lunar lava flows, reminding us that our lunar satellite has a complex geologic history:

Merging clusters in 30 Doradus.

Credit: NASA, ESA and E Sabbi

Delicate Nature and Animal Embroidery by Emillie Ferris 

UK artist Emillie Ferris composes stunning embroidery illustrations of wildlife and nature into pendants and oval frames. Depicting delicate animals, such as butterflies, deers and rabbits, Ferris’ choice of wildlife subjects exist in the realms of an ethereal forest.

Her embroidery technique displays meticulous talent and detail to color, shape, as well as the texture of fur, which stands out against a clean off-white background. You can find more of her dainty designs at her Etsy shop!

NGC 5189.

Credit: NASA, ESA and The Hubble Heritage Team (STScI/AURA)

Geometry and symmetry in plants, part 2

See the full thread here

Pickering’s Triangle

More Than You Ever Wanted to Know About Mechanical Engineering: Strain Energy for Some Common Situations

Last time, we talked about strain energy - the energy that is stored when an object undergoes deformation due to applied stress. We worked out a general expression for strain energy density (the amount of strain energy stored per unit volume):

Note that this is easily convertible to overall strain energy - we would just have to integrate strain energy density over the volume of the object to get total strain energy.

The dV here is just the product of dx, dy, and dz (like regular volume is the product of x, y, and z). Or, you could say it’s the product of the cross-sectional area (dA) and dx.

Bearing this in mind, we can easily get some simple expressions for strain energy in some familiar situations.

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