Showing posts with label science images. Show all posts
Showing posts with label science images. Show all posts

28 Nov 2011

Top 10 Space Weapons (Gallery)

MISILLE
The ability to destroy man-made satellites in orbit around Earth has already been demonstrated by China, who used an anti-satellite (ASAT) device against one of their own weather satellites. The US likewise shot down a crippled spy satellite in 2008 with a sea-based missile. India has said they wish to develop similar capabilities. The problem: Huge swarms of space debris generated by blowing up objects remain in orbit, and threaten manned spacecraft.
DARPA
Does a device that uses electromagnets to shoot a stream of molten metal at incredible speed toward enemy targets sound far-fetched? The Defense Advanced Research Projects Agency (DARPA) is already working on one, with the appropriately aggressive-sounding name of "MAHEM" (Magneto Hydrodynamic Explosive Munition). Pictured is Earthlight, an Arthur C. Clarke novel that presaged exactly this device.
DARPA looks to use electromagnets to shoot molten metal at enemy targets. The futuristic military weapon is called “MAHEM”
THEL
Directed-energy weapons utilize lasers, high-powered microwaves, and particle beams. Projects in development by the US have names like Airborne Laser, the Active Denial System, and the Tactical High Energy Laser (THEL). However, before these weapons can "stun" or "kill" like a Star Trek phaser, engineers need to do much work to weaponize the various forms of energy under consideration.
Energy weapons such as lasers, high-powered microwaves and particle beams are in development by the US.
Cosmic Satellites
Home-grown microsatellite and nanosatellite technologies are being proliferated by a number of nations, hinting at some military uses. In one U.S, Department of Defense report, military officials took at face value a Hong Kong newspaper account in January 2001 that claimed China had developed and tested an ASAT system using a "parasitic microsatellite." Apparently this device could have been a small satellite designed to attach itself to other satellites to destroy or damage them. This sexy but unsubstantiated assertion quietly vanished from further DoD reports.
Microsatellite & Nanosatellite technology could be used as an anti-satellite (ASAT) device to cripple or destroy other satellites.
Soviet Union’s Almaz Space Station
Weapons in space need not be so exotic. Take the former Soviet Union's Almaz Space Station of the 1960s and '70s. The military space station reportedly carried a cannon to destroy satellites or incoming spacecraft. It was even reportedly tested (while no one was aboard the spacecraft) to demonstrate its feasibility. Other space-based conventional weapons could include more exotic packages of destruction, such as radio-frequency or high-power-microwave munitions.
The Soviet Union’s Almaz Space Station carried a cannon, space based conventional weapons could include exotic weapons such as high power microwave munitions.
MOL
In the USAF's Manned Orbital Laboratory (MOL) program of 1965, two astronauts would launch atop a Titan 3 rocket in a spacecraft similar to NASA's Gemini capsules, then conduct reconnaissance missions from orbit using ultra high-resolution telescopes. The project was scuttled in 1969, and unmanned spy satellites proved a better option later.
USAF’s Manned Orbital Laboratory (MOL) was stopped since unmanned spy satellites were a better option.
ICBM
Deploying nuclear bombs in outer space seems like a natural goal of the military. Indeed, in the 1950's the US Air Force planned to detonate a nuclear bomb on the moon. This effort, dubbed Project A 119, included a young Carl Sagan on its team. At the time, an intercontinental ballistic missile (ICBM) carrying a nuclear warhead possessed the capability to reach the moon. Fortunately, the man in the moon was spared.
X-37B Orbital Test Vehicle (OTV)
Scheduled for a test flight on April 20, 2010, the reusable robotic X-37B Orbital Test Vehicle (OTV) is a small space shuttle-like craft developed by the US Air Force. If such a reusable space plane becomes feasible, it will offer unheard-of capabilities for launch on-demand, surprise, and flexibility. If those benefits aren't enough, the space plane may be outfitted with a weapon to drop tungsten rods on Earth targets from outer space, the so-called "Rods from God."
High-altitude Weapons
High-altitude weapons using electromagnetic energy may destroy and disrupt electronic and electrical devices, causing a burst of electromagnetic radiation (electromagnetic pulse, or EMP) to produce current and voltage surges. These bursts are commonly associated with nuclear explosions, but scientists have produced non-nuclear EMP's. The construction of small "e-bombs" poses a significant terrorist threat against airplanes.
High-altitude weapons would use electromagnetic radiation (EMP) to produce current & voltage surges. These “e-bombs” can pose a threat to airplanes.
Manipulating an orbiting asteroid
Could an orbiting asteroid be manipulated to smash down on an enemy target on Earth? It's possible, but doesn't seem like an efficient way of doing battle, according to a RAND think-tank report. More effort would be required to achieve such a result than was employed to develop the first A-bomb during the Manhattan Project in WWII, says RAND.
Source: LiveScience
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26 Nov 2011

2011 Olympus BioScapes winners (special photography)


The 2011 Olympus BioScapes competition brings the beauty of micro-organisms out of the lab. Here is a gallery of our favourite images from the contest, including petite plankton, dinky Drosophila and miniscule mould spores.
Strawberry ovaries (click to enlarge image)
 These fruit-fly ovaries look almost like strawberries hanging from a vine due to the background staining, which has coloured them red. Gunnar Newquist of the University of Nevada, Reno, took seventh place with this image, which highlights the muscular and neural structure of the Drosophila melanogaster reproductive system through fluorescence microscopy.
(Image: Gunnar Newquist)
Hairy wheels (click to enlarge image)
 The fast-moving cilia, or hairs, that give this rotifer – "wheel bearer" – the illusion of rotating wheels are frozen in time in this winning image from the 2011 Olympus BioScapes competition. The cilia on the lobes of the rotifer Floscularia ringens gather food particles from the surrounding water and direct them toward its mouth. Charles Krebs of Issaquah, Washington, used a technique called differential interference contrast microscopy to make this image of the creature sitting in a self-made tube constructed from detritus.
(Image: Charles Krebs)
Art or amoeba? (click to enlarge image)
It's hard to imagine a skeleton that looks as beautiful as the single-celled radiolarian does in this image, which received honourable mention. The picture, created by Christopher Jackson of Bern, Switzerland, captures the mobile amoeba's mineral skeleton through the bright-field imaging technique with extended depth of field. These protozoans are found throughout the ocean and their skeletons cover the ocean floor, making up radiolarian ooze.
(Image: Christopher B. Jackson)
Grass cut (click to enlarge image)
 A cross-section of a marsh grass of the genus Juncus is shown here emitting light naturally in a process called autofluorescence. The chlorophyll on the outside of the leaf can be seen in red in the image, which was shot by Jan Martinek of the Czech Republic. The vascular bundles – structures that transport water and minerals through the plant – are shown in blue. This image also received honourable mention in the competition.
(Image: Jan Martinek)
Fluorescent fungus (click to enlarge image)
 Slime mould is no ordinary mould - it's a fungus that also has animal genes. Although they possess no nervous system, slime moulds have been shown to navigate mazes and communicate with one another. The spores of the slime mould Physarum leucophaeum are seen here in a fluorescent micrograph from Dalibor Matýsek of VÅ B-Technical University of Ostrava, Czech Republic. His image received honourable mention and shows off the beautiful patterns and structures of this strange creature.
(Image: Dalibor Matýsek)
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11 Nov 2011

Mars volcano in Pictures(6 Photos)

The European Space Agency recently released stunning images of one of the planet's most striking features: the Tharsis Tholus volcano.
The area surrounding the mountainous landmark is relatively bare, causing the huge Martian structure to stand out. When active, Tharsis Tholus was likely much larger than it is today. Image Credit: ESA/DLR/FU Berlin (G. Neukum). Photo courtesy of Tecca
The planet Mars is a bit of an obsession for the human race. We've romanticized the red planet in everything from movies to video games, and we can't seem to get enough of the barren, desert-like planet. The European Space Agency isn't immune to Mars lust, and the organization recently released some stunning images of one of the planet's most striking features: the Tharsis Tholus volcano. Presented with false color to highlight its geographical features, the once-lively mountain is still a sight to behold. Join us as we take a tour of a true Martian landmark. Image Credit: ESA/DLR/FU Berlin (G. Neukum). Photo courtesy of Tecca
The Tharsis Tholis volcano stands 5 miles tall on the rocky Martian landscape, dwarfing the tallest volcanoes on Earth. Ojos del Salado on the Argentina-Chile border comes closest, measuring 4.2 miles tall. Image Credit: ESA/DLR/FU Berlin (G. Neukum). Photo courtesy of Tecca
 The expansive crater located in the center of the volcano resulted from the loss of supportive magma that the mountain spewed billions of years ago. With the interior of the volcano lost, its roof caved in, forming the giant hole we see today. Image Credit: ESA/DLR/FU Berlin (G. Neukum). Photo courtesy of Tecca
Over the course of billions of years, Tharsis Tholus has become dotted with the scars of small to medium-sized impacts from space debris. The mountain is in an advanced state of erosion, making it particularly interesting to scientists looking to study the history of the red planet. Image Credit: ESA/DLR/FU Berlin (G. Neukum). Photo courtesy of Tecca
 Tharsis Tholus' large size is aided by the relatively low gravity of Mars. With less than half of the gravitational force of Earth, it is easier for huge geographical features to exist on the Martian landscape. Image Credit: ESA/DLR/FU Berlin (G. Neukum). Photo courtesy of Tecca
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