From Physics Research Archive
NASA Releases Images of Earth by Distant Spacecraft ` - Sep 1, 2013
For an interesting perspective on the solar system, take a look at this image of Saturn, its rings, and Earth, which is the blue dot near the bottom right (indicated by the arrow). NASA claims that the moon can be seen sticking out on the right of this tiny blue dot slightly to the right of center (compare with the image in this earlier Physics to Go feature). To learn more, visit this NASA news item.
Wikipedia: Supercontinuum ` - Aug 1, 2013
The photo above shows a "supercontinuum" laser, which produces laser light in much of the visible spectrum (red, orange, yellow, green, blue, indigo, violet). In this photo, the laser light hits a diffraction grating, which acts like a prism and reveals the individual colors of the light. Look how bright the light of each color is!
Argonne University scientists reveal insect respiratory function ` - Jul 1, 2013
The image above is an x-ray of a fruit fly, made with x-rays produced by a particle accelerator. As you can tell from the parts of the image where the legs overlap the body, you are able to see right through the fly.
Supernova 1987a ` - Jun 1, 2013
Here is a before-and-after view of a part of the sky where a supernova appeared in 1987. A supernova is a catastrophic explosion in a large star. Two hours before this supernova was seen through telescopes, it was announced by a spike in the count of neutrinos in several detectors on Earth. The arrow points to the star before it exploded.
Greenhouse Effect ` - May 1, 2013
This is the famous "Keeling curve" of carbon dioxide concentration in the atmosphere versus time, from about 1958 to about 2007, measured in Hawaii. Notice that the rate of warming (indicated by the slope of the blue line) increases slowly but steadily over time.
Solar Flares--Solar Prominences ` - Apr 1, 2013
This image of a solar prominence was captured in extreme ultraviolet light on December 31, 2012. The prominence is ionized gas--charged particles, with electrons stripped from atoms, which move due to forces from magnetic fields.
image credit: Xiaodong Chen and Vigor Yang (School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA); image source; larger image.
APS Division of Fluid Dynamics 2012 Gallery of Fluid Motion ` - Feb 1, 2013
This image is a high-resolution computer simulation of the head-on collision of two tiny drops, one moving up and one moving down. The drops approach each other with a high velocity, so there is considerable energy in the collision. For more information, see this description.
NASA's IMAGE Satellite View of Aurora Australis from Space ` - Jan 1, 2013
You are looking at a composite: The image of the southern lights (Aurora Australis) is superimposed on a "Blue Marble" image of Earth; both images were captured by satellite. Click on NASA's IMAGE Satellite View of Aurora Australis from Space to see a video of this aurora.
Mission to the Edge of Space ` - Dec 1, 2012
The figure at the bottom of the photo is Felix Baumgartner, shortly after he jumped from an altitude of 39 kilometers (24 miles). There, the thin atmosphere produces very little air resistance, so he was almost in free fall (in free fall, the only force acting on an object is gravity). He accelerated rapidly, broke the sound barrier, and went on to about Mach 1.2 (20% above the speed of sound).
Physics Images: Bent-Core Liquid Crystals ` - Nov 1, 2012
Here is an image of a "bent-core liquid crystal"-- to learn more about these substances, visit Physics Images: Bent-Core Liquid Crystals.
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