Controlling friction by tuning van der Waals forces

more »

For a car to accelerate there has to be friction between the tire and the surface of the road. The amount of friction generated depends on numerous factors, including the minute intermolecular forces acting between the two surfaces in contact – so-called van der Waals forces. The importance of these intermolecular interactions in generating friction has long been known, but has now been demonstrated experimentally for the first time.

via Science Daily

Large coronal hole near the sun's north pole

more »

Astronomers captured an image of a gigantic coronal hole hovering over the sun's north pole on July 18, 2013, at 9:06 a.m. EDT. Coronal holes are dark, low density regions of the sun's outermost atmosphere, the corona. They contain little solar material, have lower temperatures, and therefore, appear much darker than their surroundings.

via Science Daily

Zazzle Space Exploration market place

Astronaut Mp3 Speakers

Astronaut Mp3 Speakers

$31.95

via Zazzle Outer Space market place

Antennae Galaxies Colorful Composite Announcement

Antennae Galaxies Colorful Composite Announcement

$1.70

via Zazzle Outer Space market place

Funny Astronaut Greetings Card

Funny Astronaut Greetings Card

$2.60

via Zazzle Outer Space market place

Spiral Galaxy NGC 3627

more »

(Phys.org) —The spiral galaxy NGC 3627 is located about 30 million light years from Earth. This composite image includes X-ray data from NASA's Chandra X-ray Observatory (blue), infrared data from the Spitzer Space Telescope (red), and optical data from the Hubble Space Telescope and the Very Large Telescope (yellow). The inset shows the central region, which contains a bright X-ray source that is likely powered by material falling onto a supermassive black hole.



Zazzle Space market place