Children change the subject when they have nothing to offer to the subject at hand.<quoted text>
No, the probability wave function spreads "everywhere". When a photon interacts with other particles, like those in your eyeball, the wave function collapses to a single location, which can only be predicted according to the probabilities in the original wave function. Its quantum physics and at that level particles behave nothing like the large scale reality you expect to see every day. And you will not ever bother to learn anything about it.
There IS a case of individuals seeing single photons, and that was in Rutherford's famous experiment where he "split the atom". He had observers sitting in total darkness for half an hour than observing the tiny flashes as alpha particles bounced off gold nuclei, emitting a single photon in the process. This is how he learned about the internal structure of the atom, one of the most famous experiments of all time.
"A dust tail like Earth's could produce a bigger signal than a planet does. And it could alert researchers to a planet too small to see otherwise."
Earth has a dust tail not because the planet itself is particularly dusty, but rather because the whole solar system is. Interplanetary space is littered with dusty fragments of comets and colliding asteroids. When Earth orbits through this dusty environment, a tail forms in the rear, akin to swaths of fallen leaves swirling up behind a streetsweeper.
"As Earth orbits the sun, it creates a sort of shell or depression that dust particles fall into, creating a thickening of dust Ė the tail Ė that Earth pulls along via gravity," explains Werner. "In fact, the tail trails our planet all the way around the sun, forming a large dusty ring."
A computer simulation of Earth's dust tail/ring seen from a vantage point outside our solar system. Colors indicate density; purple is lowest, red is highest. Credit: Christopher Stark, GSFC [larger image]
Spitzer's recent observations have helped astronomers map the structure of Earth's dust tail and figure out what similar "tell-tale tails" attached to alien planets might look like.
Like our own solar system, other planetary systems are infused with dust that forms a dusty disk encircling the central star. And like Earth, exoplanets interact with their dust disk gravitationally, channeling and drawing strange features into it.
"In some stars' dust disks there are bumps, warps, rings, and offsets telling us that planets are interacting with the dust," explains Mark Clampin of NASA's Goddard Space Flight Center. "So we can 'follow the dust' to the planets. So far, we've seen about 20 dust disks in other solar systems. And in some of those cases, following the dust has already paid off."
Clampin, Paul Kalas, and colleagues were looking for a planet around the bright southern star Fomalhaut when they unexpectedly found a dust ring. The shape of that ring led them to their goal. "We suspected that the ring's sharp inner edge was formed by a planet gravitationally clearing out the surrounding debris," says Clampin. "We tracked the planet by this 'footprint' in the dust." (See the footprint here.)
Another Hubble image shows a dusty disk around Beta Pictoris, a star in the constellation Pictor, or "Painter's Easel," pictured below: