Many times I have seen a white line passing in Sky,what is it?

Question

THIS WHITE LINE HAVE SMALL POINT IN FRONT & AS IT MOVE FORWARD ITS TALE SIDE EXPANDS BY SIZE & LASTLY THE FRONT END BLAST

Answer 1

Sounds like a contrail left by an aircraft moving at high altitude. This is condensed water vapor, caused to condense by the motion of the aircraft or the condensed moisture from the engine exhaust.

Answer 2

Rocks, chunks of ice and rocks mixed up, and other such debris float around and zoom around in space. When space debris bumps into our planet, it first enters and passes through our planet's atmosphere. Our atmosphere causes friction and heat, which burns space debris and we can sometimes see that burning, which looks like tiny white lines that zip across the night sky for a brief second.
Last year, such debris of some kind was seen by people all over the world as bright green chunks streaking through the night skies. That debris, I was told, contained the element "copper", which burns green in atmospheres containing oxygen, such as ours. Space debris can fall in so-called "showers" during predictable times of the year and have names such as the shower of "Leonids", the "Taurids" or the shower of Perseids (around August 11). Sometimes, space debris can be so big that all of it doesn't burn away into harmless gas and dust on its way to the surface of this planet. That kind of debris is the kind that hits the land and causes damage and craters, like all the pock-marks on the moon. More space debris hits the moon than it does the Earth because the moon doesn't have much of an atmosphere to burn up the debris. Large space debris is called "meteors". Meteor debris is very vaulable to collectors and reseachers.
Sometimes we can see other kinds of space geology, such as comets, as they travel by our planet on some long endless journey. And, sometimes we can see man-made objects in the night sky that slowly pass overhead or along the horizon, such as communication satelites, the U.S. Space Shuttle and the International Space Station. People call the little space debris that streaks across the night skies, "shooting stars."

Answer 3

This is called a "con trail" or condensation trail and consists of water vapor. It comes from water vapor in the jet exhaust that condensed in the cold air at high altitude, and also from pressure changes in the air flowing over the wings. See http://en.wikipedia.org/wiki/Condensation_trail

Answer 4

It's probably a plane (jets usually have white smoke in the back).
I see it a lot and it's very common.

Nothing to freak out about. Don't worry.

Answer 5

If you sensing the same feeling so many times, you should contact eye specialist. Your eye might have some defects, dont neglect.

Answer 6

might be a jet plane pasing by and leaving a white tail behind

Answer 7

these are gases ejected by fighter plane it expands in air slowly

Answer 8

it is a jet plane.
it leaves a white smoke trail, which shines due to sunlight.

Answer 9

I too experience such aerial mass. I feel its an asteroid

Answer 10

I"m guessing it's your IQ going kaput.