Artery tissue layers, fluorescent light micrograph. Fluorescent dyes have been used to highlight tissues and cellular structures: microvasculature (red), smooth muscle (green), cell nuclei (blue), intima (pink). The layers seen here are the tunica intima (right, pink, the internal layer), the tunica media (center, green, the middle layer) and the tunica adventitia (left, red, the outer layer).
One of the most significant challenges related to global climate change is rising sea levels. Since the beginning of the 20th-century, sea levels have gradually risen by 16 - 21 cm (6.3 - 8.3 in). The rise in sea levels has also accelerated over time due to thermal expansion (the change in the volume and area of matter due to increased temperatures) and the melting of ice sheets and arctic glaciers. Stock Image Gallery of Rising Sea Levels Researchers have calculated that arctic sea ice has declined by 10% in the last 10 years. In addition to rising sea levels, this has altered the circulation of the Atlantic Ocean, destroying fisheries in northern countries and creating massive storms and hurricanes. Coastlines around the world remain susceptible to flooding. Some at-risk coasts include the Miami shore, Rio de Janeiro, Osaka and Shanghai. The Egyptian city, Alexandria, faces a particular threat as much of its population exists in low lying coastal areas, which will likely be inundated w…
After seeing hundreds of dazzling galaxies and nebulae in print, one might have a preconceived notion of what it’s like to look through a telescope. The reality, however, is somewhat different.
Celestial objects such as galaxies, star clusters, and planetary systems are some of the most beautiful treasures in outer space. Unfortunately, they’re so far away that they mostly appear faint to the naked eye, even when viewed through a telescope. The problem is that, unlike a camera, our eyes cannot adjust their exposure time in order to soak up more light from these distant objects.
For astrophotographers to get the vibrant colors of a nebula or galaxy, they need to rely on a number of techniques, including long exposures, color compositing and sometimes editing in post-production.
Eagle Nebula, Messier 16. SS2596669.
The famous Eagle Nebula pictured here is actually three monochromatic images mapped to different color wavelengths combined to create one image. Some might say that this mak…