Sun

Solar activity (19)
Solar flare (15)
Solar radiation (12)
Solar system (96)
Solar wind (29)
Sun (381)
Sunlight (331)

Synopsis: Domenii: Space: Space generale: Celestial body: Star: Stars: Sun: Sun:

when powered only by the Sun . If you would like to comment on this slideshow or anything else you have seen on Future,

Since these planets are expected to be small and faint compared to their sun, spotting them is tricky with existing ground-based optical telescopes."

which is just 1/23rd of the distance from the Sun to Mercury.""By far the most powerful combination right now is the combination of transit detections and Doppler spectroscopy,

#But to really find a habitable Earth-twin orbiting a star just like our Sun,

That's one possibility if Harvard professor Daniel Nocera's idea for a device that can harness and store energy from the Sun comes to fruition.

which focuses the sun rays to create obsidian. Other transformative processes include Ginger Krieg Dosier printed sandstone bricks of bio-manufactured masonry grown using bacteria.

And until the sun comes up really that you know authorities can't get in and really begin to assess

the Solartab lets its users charge any mobile device using green, sun-fueled energy. And even more impressively, ipad enthusiasts can charge their beloved touch-screen gadget even

as long as the sun is out, the Solartab will always charge at maximum efficiency. To keep this promise,

After adjusting the angle to the sun current position, all that left to do is plug in any smartphone

in order to make use of a wider range of the sun energy. The work here is in the solar realm known as thermophotovoltaics,

#Smart sensors that harvest power from sun heat or vibrations European researchers have developed advanced energy harvesting technology that allows wireless sensor networks to power themselves from the sun, heat or vibrations.

But what if sensors could harness energy directly from their environment from the sun, from ambient heat, from radio waves or vibrations?

"Harvesting the sun, vibrations and radio waves The SWAP team are studying, testing and deploying novel technologies that enable sensors to use solar

where the sun emits more than 40%of its radiation. By improving the reflectance of the materials,

adds to the difficulty of cooling down sun-kissed cities. To meet their objectives, the partners incorporated nanoparticles and micro-or nano-sized pigments into coatings and surface layers. e implemented this technology for three types of material:

It demands a lot of sun, good soil, water and cold temperatures. But how do you install an environmentally friendly and sustainable cooling system in a country so warm?

"We all get heat from sun. We feel it on our bodies when it's warm,

but who ever heard of getting cold from sun? That's what MEDISCO is about.

not only but also that real skin regeneration is occurring##says Zhaoli Sun director of transplant biology research at Johns Hopkins School of medicine.##

The sun consists of hot plasma made of electrons and ions. Magnetic field lines extend from the solar surface all the way into the corona.

The researchers say this technology would be useful in places where sun and radio waves can t always penetrate such as inside walls

Solar panels can only generate power when the sun shining, and wind turbines can only generate power when the wind blows.

For nearby observers it briefly appeared brighter than the sun and caused some severe sunburns.

and more efficient at harvesting energy from the sun. For solar panels wringing every drop of energy from as many photons as possible is imperative.

and most of the energy from the sun is in the visible and infrared spectrum. â#Finding a material that exhibits the bulk photovoltaic effect for visible light would greatly simplify solar cell construction.

Moreover it would be a way around an inefficiency intrinsic to interfacial solar cells known as the Shockley-Queisser limit where some of the energy from photons is lost as electrons wait to make the jump from one material to the other. hink of photons coming from the sun

The component converts heat from the sun into infrared light which can be absorbed by solar cells to make electricity a technology known as thermophotovoltaics.

In its former life GD 61 was a star somewhat bigger than our Sun and host to a planetary system.

Imagine the distance between the sun and the star nearest to itâ##a star called Alpha centauri.

Now imagine as many as 10000 of our suns crammed into that relatively small space. his galaxy is more massive than any ultra-compact drawfs of comparable sizesays Jay Strader assistant professor of physics

One explanation for this is a giant black hole weighing in at some 10 million times the mass of our sun. Astronomers are trying to determine

The possible massive black hole combined with the high galaxy mass and sun-like levels of elements found in the stars favor the latter idea.

##Dynamo accounts for Sun s weather cycle University of Chicago University of Leeds rightoriginal Studyposted by Richard Mellor-Leeds on May 23 2013u.

what drives the generation of astrophysical magnetic fields like the Sun s. Scientists have known since the 18th century that the Sun regularly oscillates between periods of high and low solar activity in an 11-year cycle

but have been unable to fully explain how this cycle is generated. It has become increasingly important to be able to understand the Sun#s magnetic activity as it is the changes in its magnetic field that are responsible for#space weather#phenomena including solar flares and coronal mass ejections.

When this weather heads in the direction of Earth it can damage satellites endanger astronauts on the International space station and cause power grid outages on the ground.

which makes up the Sun. More importantly it does so in the extreme parameter regime that is relevant to astrophysical bodies.#

#Previously dynamos for large highly conducting bodies such as the Sun would be overwhelmed by small-scale fluctuations in the magnetic field.

The presence of spots on the Sun has been known since antiquity and further analyzed after the invention of the telescope by Galileo in the 16th century.

At the start of the 20th century it was recognized then that these sunspots were the result of the Sun#s magnetic field.

#New Spanish streetlight powered by the sun and the wind The light is being developed through a collaboration between the Universitat Politècnica de Catalunya and Spanish startup Eolgreen.

Professor Sun Xiaowei and colleagues at NTU have developed a self-powered smart window that is bi-functional.

"says Sun. The scientists also used a small section of their device to power a red LED,

Sun and team are now focusing on further improving the performance of their device and are looking into commercializing the technology,

In response to that problem Panasonic is developing a new technology that looks to the sun to clean water extracted from the ground.

said the soft-spoken inventor. emperature from the sun does not go beyond this level in terms of heating

He wanted to find a project in which the sun did more than just power a device.

With enough sun, a large lens and an ample supply of sand, he figured he might be able to produce glassware.

He knew the sun would move and the focal point would shift during the process, so he ordered a single 4. 5-foot-wide lens

and solar panels at the other, can pivot from straight overhead down to a 45-degree angle to chase the sun. directed by a CAD design from a connected laptop,

The sun melts the sand, which cools into glass. When the electronics began overheating, Kayser cut open a soup can,

The sun melted only the sand, and, after more than four hours, he printed a glass bowl,

Kayser digs the object out of the sandbox TRACKING Kayser attached a cylindrical sun tracker to the frame perpendicular to the lens.

When the sun is directly in line with the lens, it shines straight through an opening in the top of the cylinder.

As the sun shifts, the light comes in at an angle, creating shadows within the cylinder.

they also benefit from the sun tracking, which ensures that they always get direct light.

such as this#solar-powered one that flew cross-country using the power of the sun. But,

while in sun-blasted Arizona the state s big utility tried to short-circuit a solar boom.

when the sun isn t shining. In Arizona, that credit is calculated at retail rates and APS argued that penalized homeowners who don t go solar as the utility will be forced to raise their rates to pay for the transmission system

and we can build every product under the sun for those people. And we re going to try and do it.##

It will generate between 1-3 Gallons Water/day depending on the humidity conditions and sun conditions.

which is capable of concentrating the sun rays into a stream 2000x more powerful. The process of trapping sunlight also produces water that can be used to produce potable water and other modern day amenities such as air conditioning.

which is attached to a tracking system that determines the best angle based on the position of the sun. Such system can be applied profitably in sunny regions where sustainable energy,

With the high concentration of the sun rays and a low cost design the team believe they charge $250 per square meter which is three times lower than normal systems.

At night you are not collecting energy from the sun and it takes a lot of power to broadcast internet signals.

the turbine helium-inflated housing is durable enough for deployment in either the blazing sun or freezing snow.

even if your previous system involved a sun dial and carrier pigeons. The things even have a cool name:

when the wind stops blowing and the sun goes down. The end goal for Tesla is that cheap batteries could help Tesla deliver its $35, 000 third generation electric car.

which help to reflect the Sun's rays back into space and so cool the planet.

#Solar magnetism twists braids of superheated gas Geoff Brumfiel hears from researcher Jonathan Cirtain why the Sun s atmosphere is hotter than its surface.

The Sun's atmosphere is just jam-packed full of magnetic field, says Cirtain. As the lines of those fields cross and twirl, the theory went,

a camera capable of taking pictures of the Sun's corona in fine detail. The imager was placed on board a research rocket at the White sands Missile Range in New mexico

which time it took a series of pictures of the Sun (see video). A team member started analysing the data on the drive back from the missile range,

The group now hopes to put the Hi-C on a next-generation spacecraft that will monitor the Sun for longer periods of time e

Exposed to the sun, a solar cell employing such nanowires can turn nearly 14 percent of the incoming light into electricity#a new record that opens up more possibilities for cheap and effective solar power.

and phosphorus that absorbs much of the light from the sun (a property known as its band gap).

however, and Baker and his team now attributes its creation to an interplanetary shock wave#a travelling outburst of solar-wind particles from the Sun#that has been detected by other craft.

#Moon-size exoplanet circling sun-like star smallest yet A newfound world called Kepler 37 b could easily blend in to the long and growing list of known extrasolar planets,

The researchers used NASA s Kepler space telescope to identify the three planets orbiting Kepler 37, a star some 200 light-years away that is somewhat smaller than the sun. The spacecraft monitors more than 150,000 stars in the Milky way

Orbiting its star at one tenth the distance between Earth and the sun, tiny Kepler 37 b must be extremely hot."

All three planets keep closer to the star Kepler 37 than any planet orbits the sun."It just shows that Kepler has just an extraordinary ability to see a wide diversity of planetary architectures,

and his team used a technique called gravitational microlensing to study a binary system with two red dwarfs small stars that are dimmer than the sun. The distance between the stars is about 10 to 15 times that of Earth

and the sun. The team found a planet about twice the mass of Earth orbiting just one of the two stars at about the same distance as we are to our home star.

But the same planet orbiting a sun-like star in a binary system would be in the habitable zone where conditions could support liquid water

But it did not yet have an ozone layer to shield the surface from the sun's harshest ultraviolet rays.

#Sun's fractal surprise could help fusion On earth THE sun has thrown us a fractal surprise.

An unexpected pattern has been glimpsed in the solar wind the turbulent plasma of charged particles that streams from the sun. It offers clues for handling plasmas that roil inside nuclear fusion reactors On earth.

and electrons the solar wind streams from the sun and pervades the solar system. Its flow is turbulent containing eddies and moving at different speeds in different directions.

One flies just within Earth's orbit around the sun the other just outside it allowing the pair to obtain unique measurements of solar wind behaviour.

when the movement of the wind's particles is perpendicular to the sun's magnetic field they resemble a fluid with sections that are smooth interrupted by bursts of violence.

These create energy in the same way as the sun by fusing a superheated plasma of hydrogen nuclei to form helium.

when the sun becomes a red giant in 6 billion years. A lot of things can happen in 6 billion years

which protects us from the bulk of the solar wind a stream of high-energy particles constantly flowing from the sun

. But sometimes the sun's magnetic field lines can directly link up with Earth's in a process called magnetic reconnection which opens up cracks in the magnetosphere.

Gas in Earth's upper atmosphere is ionised by ultraviolet light from the sun and the resulting plasma becomes trapped by magnetic fields in a doughnut-shaped ring around the planet.

Theory had suggested that an extra-strong electric field from the sun can rip plasma away from the plasmasphere during reconnection triggering a plume.

and saw a tendril of increased electron density curling away from the north pole indicating that a plume of plasma was veering off towards the sun. At the same time three of NASA's THEMIS spacecraft

and the sun's says Walsh. It gets to that boundary and helps protect us keeps these solar storms from slamming into us.

Extreme UV from the sun gets bent at the boundary where a planet's atmosphere meets space

But we also know that the sun pumps out a constant stream of charged particles called the solar wind

which repels charged particles from the sun explains Nick Schneider of the Laboratory for Atmospheric

when the sun was young and more active. Because Venus is closer to the sun the solar wind might have stripped gaseous water from its early atmosphere leaving a thick haze of mostly carbon dioxide that turned the planet's surface into a hellish desert.

And while Mars is farther away it has no global magnetic field. It is thought the solar wind thinned the Red planet's atmosphere over time making it cold and dry.

whether it is small and compact like our sun or big and bloated like a red giant the type of star the sun will swell into in about 5 billion years.

But such estimates are crude with uncertainties of more than 90 per cent. Much more accurate size and mass measurements boasting uncertainties of just 2 per cent come from studying vibrations within the star called starquakes.

or asteroseismology signals from sun-like stars says Jørgen Christensen-Dalsgaard of Aarhus University in Denmark who leads a consortium of researchers who analyse Kepler's starquake data.

The sun is currently zipping through one of the Milky way's spiral arms at a relative speed of about 23 kilometres per second ploughing through thin clouds of interstellar dust and gas.

At the same time a stream of particles blowing out from the sun the solar wind inflates a bubble of plasma around the solar system called the heliosphere Astronomers have assumed long that the sun's motion through the galaxy squashes

But until now it has been hard to see for sure what our own sun's tail might look like.

The four lobes might be a reflection of solar activity at the time the particles left the sun says IBEX principal investigator David Mccomas. The particles took a few years to reach the tail

when the sun was minimally active. Around solar minimum you get slow solar wind around low to mid-latitudes from the sun

and high speed around high latitudes says Mccomas . But he expected this would create more of a solid horizontal band of slow particles across the tail not the odd lobes.

At solar maximum the bands of slow and fast particles streaming away from the sun break down so the tail may change its shape

when the sun's activity reaches its peak says Mccomas. Ultimately a better understanding of the tail

Our own sun and the Earth and all of us are made up of atoms that came out of other stars'stellar winds long ago says Mccomas. There's a big recycling process that occurs

or our sun leaves the region of the sun and gets mixed in with the rest of the stuff.

It could be that the heliotail is acting as a funnel for cosmic rays allowing them to leak into the solar system where the sun's influence is weakest.

For a star like our sun a dusty clump in the same orbit as Earth can grow to about a metre wide.

Mars is going to pass behind the sun from Earth's perspective for the entire month of April blocking communications between the rover and mission control.

It should absorb virtually all wavelengths of light that reach Earth s surface from the sun but not much of the rest of the spectrum since that would increase the energy that is reradiated by the material

In this paper the authors demonstrated in a system designed to withstand high temperatures the engineering of the optical properties of a potential solar thermophotovoltaic absorber to match the sun s spectrum.

but also light much as window blinds tilt to filter the sun. Researchers say the work could lead to waterproofing and anti-glare applications such as smart windows for buildings and cars.

#Steam from the sun A new material structure developed at MIT generates steam by soaking up the sun. The structure a layer of graphite flakes

who led the development of the structure. specially in remote areas where the sun is the only source of energy,

From sun to steam The approach itself is relatively simple: Since steam is generated at the surface of a liquid,

which makes up almost half the sun electromagnetic radiation at the Earth surface. According to their estimates, applying their technology as an inexpensive coating on silicon solar cells could increase efficiency by as much as 25 percent.

Sun exposure to solar panels produces about 0. 5 percent of wasted heat per Degree celsius increase.

The problem with solar power is that sometimes the sun doesn shine. Now a team at MIT and Harvard university has come up with an ingenious workaround a material that can absorb the sun heat

and store that energy in chemical form, ready to be released again on demand. This solution is no solar-energy panacea:

since it makes the sun energy, in the form of heat, storable and distributable, says Jeffrey Grossman, an associate professor of materials science and engineering,

taking in energy from the sun, storing it indefinitely, and then releasing it on demand.

while the sun isn out, being able to store heat for later use could be a big benefit.

and can withstand extreme temperatures, sun exposure, and heavy wear, says Doyle, the senior author of a paper describing the particles in the April 13 issue of Nature Materials.

the Sun Jae Professor of Mechanical engineering at MIT. hat pretty much a description of what the ankle is.

Producing hydrogen at low cost from water using the clean energy from the sun would make this form of energy

Last spring Fan received a proof-of-concept grant from the Department of energy through the North Central Regional Sun Grant Center to determine

Sun Grant promotes collaboration among researchers from land-grant institutions government agencies and the private sector to develop

Over the years scientists have been very successful at making complex 3d shapes from DNA using diverse strategies said Wei Sun a postdoctoral scholar in the Wyss'Molecular Systems Lab

and functionally-relevant materials such as gold and silver Sun said. Just as any expanding material can be shaped inside a mold to take on a defined 3d form the Wyss team set out to grow inorganic particles within the confined hollow spaces of stiff DNA nanostructuresthe concept can be likened to the Japanese method of growing watermelons in glass cubes.

It should absorb virtually all wavelengths of light that reach Earth's surface from the sun but not much of the rest of the spectrum since that would increase the energy that is reradiated by the material

In this paper the authors demonstrated in a system designed to withstand high temperatures the engineering of the optical properties of a potential solar thermophotovoltaic absorber to match the sun's spectrum.

Guo J. F. Liu J. Sun C. N. Maleksaeedi S. Bi G. et al. Effects of nano-Al2o3 particle addition on grain structure evolution and mechanical behaviour of friction-stir-processed Al.

calibrated to one Sun illumination (natural sunlight). The measurement itself is conceptually simple:""We're applying an oscillating voltage across the device

"Co-authors are Xiaoping Hong, Jonghwan Kim, Su-Fei Shi, Yu Zhang, Chenhao Jin, Yinghui Sun, Sefaattin Tongay, Junqiao Wu and Yanfeng Zhang.

It's a pitfall that could be important to understand in the development of long-lasting solar cells where sun could provide risky heat into the equation.

Bill Joy-Chief Scientist and Cofounder-Sun Micro Systems sums it up best in this Wired article.

A Bright Flash From The Sun At 8: 30 p m. Eastern time yesterday a solar flare peaked on the surface of the sun emitting an intense burst of radiation.

The sun is currently undergoing a solar maximum a peak of activity that occurs about every 11 years making solar flares like this more likely.

#How Technology Will Make Everyone A Great Photographer At the end of May the Chicago Sun-Times laid off all its staff photographers.

#As one might expect the Sun-Times decision has met with criticism. It s been called â##shortsightedâ

#and â##idiotic. â#There s even a Tumblr of head-to-head comparisons between the Sun-Times

And in theory it will give the Sun-Times even more reach by leveraging the cameras already in place at news events.#

The Sun-Times to benefit from that type of machine vision the software will need to process larger image batches from multiple sources.

In time those pieces may come together proving that the Sun-Times decision wasn t foolish it was just a bit before its time.#

#One In Five Sun-Like Stars Have Earthlike Planets Back in February a team at Harvard announced they had found a possible Earthlike planet just 13 lightyears away.

and one-thousandth as bright as the sun. But in this week's PNAS Online Early Edition a team of researchers from#University of California at#Berkeley released a study that looks at how common Earth-size planets

are around stars that are more like our sun. The study found that for stars that more closely resemble our sun about 22 percent

The habitable zone includes orbits where planets receive the same amount of stellar energy from a star as the Earth receives from the sun. Earth-size planets include those that are between one and two times the size of Earth.

These stars'surface temperatures range from just a bit hotter than the sun's 5778 Kelvin to as cool as 4100 Kelvin all of which are hotter than the M-class red dwarfs studied previously.

or at all and get a job after graduation. â#Doing scientific research in Antarctica is incredibly important and expensive According to a March 2012 article in the NSF-funded Antarctic Sun

zee44. comwhen the shark looks up from the depths of the water seeing the surface with the swimmer having the sun overhead silhouetting the swimmer the happy shark with open its mighty jaws with delight of his soon to be eaten meal of

what he believes is a seal shadowing the sun. Of course biting the diver will be a little a big wad of gume with the camouflage rubber wet suit.

-or no-carbon economic development projects such as expanding their energy generation capacity with renewables like sun and wind instead of fossil fuels.

#Earth's Water Is Older Than The Sun Since water is one of the vital ingredients for life On earth scientists want to know how it got here.

One theory is that the water in our solar system was created in the chemical afterbirth of the Sun

#But a new study published today in Science suggests that at least some of Earth s water actually existed before the Sun was born

or whether it was cooked up in the birth of the Sun.#To find out researchers used mathematical models to#virtually recreate#the young solar system's protoplanetary disk--the cloud around the newborn#Sun. They found that based on the temperature

< Back - Next >

Overtext Web Module V3.0 Alpha
Copyright Semantic-Knowledge, 1994-2011