Sentences with phrase «radiation pressure»

Small gravitational disturbances inside this plasma tried to draw the matter into clumps, but radiation pressure from the energetic photons fought back.
The knowledge that acoustic waves can exert a force — the acoustic radiation pressure effect — on an object to keep it in suspension was discovered more than 100 years ago.
In our models we consider collisions, direct radiation pressure, and drag forces, i.e. the actual physical processes operating in debris discs.
The discovery of large reservoirs of crystalline material close to the stars suggests that similar grains in the cooler, outer parts of protoplanetary disks, where comets form, have somehow been transported outward, he says, maybe as a result of radiation pressure from the young star.
Atoms are slowed and cooled by radiation pressure from laser light and then trapped in a bottle whose walls are magnetic fields.
While optical forces such as radiation pressure have been studied and harnessed for a while, angular momentum and the force it induces, optical torque, have remained relatively unexplored.
«The bottom line is that we're paying a lot more attention to modeling very small accelerations, such as those exerted by solar radiation pressure, than previous missions have had to do,» said Michael Moreau, OSIRIS - REx flight dynamics system manager at Goddard.
Pulsations in combination with radiation pressure on newly formed dust grains are thought to be chiefly responsible for driving the stellar wind.
It could be a mechanical object that vibrates, and maybe radiation pressure could be used to control the oscillation.
The researchers modeled how radiation pressure and PeI work together to affect the movement of dust and gas.
wayne says: August 5, 2010 at 3:36 pm «Increase a LW interacting GHG in the atmosphere... causes absorption / random radiation... the 1/2 down increases radiation pressure... atmosphere expands... thus it cools... BUT, radiation 1/2 down causes an increase in temperature... warming equals -LRB-??)
The cloud forms a comet - like tail as a result of the starlight's radiation pressure pushing on the escaped hydrogen.
Incrementally adjusting its angle as it approaches to soak up more radiation pressure from the stars, that sail could bleed off enough speed to be captured into orbit within the system.
As far - off as that is, the timing could be much worse, Heller says: Sending their sail directly to Proxima Centauri would demand much slower interstellar speeds due to the smaller star's weaker radiation pressure and braking ability, raising the total travel time to nearly a millennium.
This is because the greater radiation pressure from Alpha Centauri A and B provides more deceleration, and thus a faster approach, for any light sail targeting the system.
Waves of light or sound fired at an object tend to bounce off its surface like raindrops on an umbrella, collectively exerting a subtle nudge called radiation pressure that pushes the object away.
They predicted that this spin momentum would produce a transverse spin - dependent optical force, a few orders of magnitude weaker than the usual radiation pressure.
So physicists got to wondering whether radiation pressure could be harnessed to help an item soar.
By coupling a nanostring to an optical waveguide, Kippenberg's lab recently demonstrated the ability to «hear» the gentle sound of photons flowing in a laser beam (each imparting a tiny radiation pressure force to the string).
These are big enough to be pushed away by the star's intense radiation pressure, which explains the star's rapid mass loss.»
The gross asymmetries of the outer dust field are telling us there are a lot of forces in play (beyond just host - star radiation pressure) that are moving the material around.
These might arise from mechanical effects — for example, selective radiation pressure or photospheric diffusion and element separation — rather than from nuclear effects.
With the inclusion of radiation pressure, the 2017 models show how these two factors can create spirals like those also observed around the same star.
Such a coating may increase the asteroid's reflectivity, enabling deflection by solar radiation pressure.
Increase a LW interacting GHG in the atmosphere... causes absorption / random radiation... the 1/2 down increases radiation pressure... atmosphere expands... thus it cools... BUT, radiation 1/2 down causes an increase in temperature... warming equals -LRB-??)
Vinković's model «shows how dust grains propelled by radiation pressure can travel from the disk's hottest regions to its icy outer edges,» says astronomer Dániel Apai of the Space Telescope Science Institute in Baltimore, Maryland.
But the twin stars» radiation pressure has its limits; if Heller's and Hippke's 100,000 - square - mter light sail came in any faster than 4.6 percent light - speed, it would simply overshoot the system.
At sea level on Earth, sunlight's «radiation pressure» is about 50 million times smaller than atmospheric pressure.
Christine Démoré, an engineering physicist at the University of Dundee in Scotland, and colleagues set out to reverse the direction of that radiation pressure, so that an object would get pulled rather than pushed.
Manufactured in bulk, low - cost Sprites could be deployed and networked by the hundreds or thousands to create space - based sensor arrays of unprecedented breadth, with each craft so lightweight that it could operate without propellant, shifting or maintaining its orbit solely through the radiation pressure of starlight or the forces imparted by a planet's magnetic field.
(This «radiation pressure» is the effect that powers solar sail craft like Japan's IKAROS.)
In a spherically symmetric case, matter can not fall onto a central object when the radiation pressure exceeds the gravity.
The large grains of dust observed so close to the star mean that the cloud can effectively scatter the star's visible light and be pushed by the radiation pressure from the star.
The most likely driver has always seemed to be radiation pressure, the force that starlight exerts.
Ehrenreich and his team think that such a huge cloud of gas can exist around this planet because the cloud is not rapidly heated and swept away by the radiation pressure from the relatively cool red dwarf star.
But as astronomers report online today in Nature, the galaxy is losing more gas than this — between three and 30 solar masses per year — as winds, radiation pressure, and supernova explosions from the starburst itself drive gas away.
This radiation pressure propels solar sails and helps direct comet tails so they always point away from the Sun.
Richert is lead author on the new study, which builds on Lyra and Kuchner's previous simulations by including an additional new factor: radiation pressure, a force caused by starlight striking dust grains.
Due to the faintness of the red dwarf, its radiation pressure is insufficient to stop a sail craft flying at 20 % of the speed of light before it collides with its surface.
We propose to use the radiation pressure of the star's light to slow down the probe, symmetrically to its initial acceleration using laser light.
In addition to the radiation pressure, the winds that so massive a star generates disperse its natal cloud, further limiting its growth as well as interfering with the formation of nearby stars.»
When sunlight from the Sun hits these solar panels, the photons exert a small but significant amount of force (radiation pressure).
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