If leave the place of on the earth 10 thousand light-year, cannot see earthly dinosaur period. Eradicate dinosaurianly before 65 million years, the thing before the place of 10 thousand light-year can see the world 10 thousand years only, how can you see the thing 65 million years ago? If be in,be apart from the earth the place with 65 million far light-year, have one the stage is giant telescopic, perhaps can see the setting when dinosaurian destruction. Nevertheless present binoculars sees our mankind not clear much further distance, leave us repeatedly it is not clear that near neighbour star also looks, have a planet to see hard, what is more,the rather that the dinosaur above. It is very not clear that the planet that is solar system also looks, still be probed on send detector.
The mankind " see an object " , basically be to rely on light, also cannot see with respect to what without light. For instance black hole, tremendous gravitation curvature makes light cannot escape, was in smooth lock inside, we also do not observe with respect to what. Light transmits speed in true aerial is every second makes an appointment with 300 thousand kilometer, when we see the thing around, be the instant can see, but the corporeal transmission of distant distance is met delay time, for instance the place of 600 thousand kilometer, the figure that we see is the appearance before 2 seconds.
The sun is apart from us 150 million kilometer, also can state divide for 8 light. Transmission of sun's rays line wants 8 minutes to the earth, the sun that so we see is the appearance 8 minutes ago. Cosmic scale is too large, distance unit inconvenience is stated with the kilometer, be stated with light-year. So light-year is not quantum of time, however unit of a distance. One light-year is solely namely in vacuum travel distance of a year, it is 9.46 trillion kilometer about. The light that the place with 1 far light-year comes out wants ability 1 year to arrive see, the thing that sees so the appearance 1 year ago.
So, the place of 10 thousand light-year views the world, it is the earth 10 thousand years the appearance before, that times did not have dinosaur already, however the mankind is regnant earthly times. Wanting the world that the place with 65 million far light-year sees just is the earth 65 million years ago, in those days is dinosaur is in extinct evening times. But in 65 million light-year far place views the world, that can want to compare the technical talent with earthly very much now tower above to look clear.
