A common eye can see stars at a distance of 2.5 million light years in andromeda galaxy? With the help of tele?

When you look at an object in space that is, lets say, 10 light years away from us, you see it the way it was 10 years ago, because it took 10 years for the light to travel from that object to us

The galaxy puts out its own light and has been doing so for billions of years. The light you see "now" when you look into the sky or put your eye to a telescope left the Andromeda Galaxy around 2.5 million years ago. Similarly, the light you see from Alpha Centauri (assuming you can see it in your sky) left that star some 4.4 years ago.

Your eye sees only photons from any source, but only when they reach your eye. The photons may travel across a room from a candle or from vast distance like a star or distant galaxy. The telescope has lenses that bend the light (photons) producing an image that is easier to see (higher resolution) but it handles only photons completing their distant trip at the moment you see them.

The 'vision of eye' would have been faster than light, only if we could see the stars 1300 crore light years away in their current condition. When we see 1300 crore light years away, we see 1300 crore light years in the past. What i mean is that, we see the star in its situation 1300 crore light years ago. We will see the stars current situation after 1300 crore years. The light emitted from the stars 1300 crore light years away, reaches us now, after 1300 crore years. When we say we see stars 1300 crore light years away, we mean that we see the light from this star which just reached the earth, after 1300 crore years of its emission.

You are seeing the light (hence the star) as it was millions of years ago. Notice how fireworks are visible before you can hear them? it doesn't have anything to do with the speed of your eye, but rather the speed of light. If the star were to blow up right now, you would not see it for millions of years.

I've personally seen the Andromeda galaxy with just contact lenses. It's not the farthest object anyone has seen. M33 is slightly farther. M81 and m51 are much farther. There's at least one quasar that's 2.5 billion light years away at around 12th magnitude. That's within the range of a back yard telescope with just your eyeball. With photography, the telescope can be much, much smaller, since you can do time exposures. The eye accumulates light over a period of about 1/15th of a second. It's a little longer if the eye is dark adapted (used to the dark). It's not the distance to the object that matters. It's the brightness. Telescopes help with the brightness by collecting light from a larger area. So the diameter of the big end of the telescope is the bit that matters. Magnification is not as much of an aid. The reason that some quasars at over 2 billion light years away are brighter as seen from Earth than most of the stars in the galaxy is that quasars are much, much brighter from the start. It could also be noted that stars range from about 1/10,000th as bright as the Sun to about 100,000 times brighter. So most of the bright stars you can see at night aren't the ones that are terribly near by. Deneb is probably 3,000 light years away, but it appears only slightly dimmer than Sirius, at 11 light years.

You only see the photons with your eye (with or without the help of a telescope) when they actually reach your eye, which is _after_ they've travelled the distance at light speed. Your use of "crore" is very confusing for most users here. This term is only used in a few places in the world, and even there has different meanings in different countries. Yahoo!Answers is an international community, so you should keep to terminology in international usage.

what the **** is a crore? this is an english-speaking forum. anybody can see m31 under dark skies. the light took 2.5 million years to get here. so what? when i look at galaxies in the virgo cluster i am seeing light that is as old as the dinosaurs. again, so what? 3c273 is even further away than that; its light is older than multicellular life on earth. i'm not certain i follow you. what were you asking?

Hey, if u get the ans. please tell it to me also.