Which part we can see in the Universe at the present ?

We can see the limited part of the Universe.

The light comes from the near star was passed in the past.

And, the light comes from the far away star will be passed in the future.

How to estimate that area we can see at the present?

We can estimate by using this Figure.

In the figure, we are on the AOL(astronomical observer line).

Observer line calculation method

In the case of constant velocity acceleration.

 

t_current =t+L/C

t_current=t+(L_initial +(1/2)vt)/C

where (1/2)v is average velocity value from Big Bang to a point.

Solve above equation to the v.

v=(2C t_current -2L_initial)(1/t) -2C

one point expansion L_initial=0

v=(2C t_current )(1/t) -2C

v; speed of expansion(1x10²²km/billion year)

C; speed of light(9.46x10²¹km/billion year)

t; time(billion year)

t_current; current time(13.75 billion year)

Edited November 27, 201213 yr by alpha2cen

This was the panoramic view of night sky about 1.75billion year ago.

At that time, the light, comes from the 2 billion away star, was started about 10.6 billion Universe light year.

Edited November 30, 201213 yr by alpha2cen