Viewing a single comment thread. View all comments

Ghostsarepeopletoo t1_j66m9vm wrote

Reply to comment by Anonymous-USA in If you could instantaneously place a space telescope at any desired distance (LYs), from any planet/galaxy etc., where would it be and what would you be documenting? And for what purpose? by kennyarsen

The observable universe is 90 billion ly across.

9

Anonymous-USA t1_j66vbvj wrote

The observable universe is 45B ly in all directions only because the objects we see now in almost 14B years have moved 45B ly away by now.

The universe has an observable event horizon about 16B light years away. Any light leaving now from that distance may be observed (in 16B light years). But beyond that the expansion of space exceeds light speed and we will never see that light. Or hypothetical telescope signal.

So don’t put your telescope 90B ly away. Or 45B. Or 16B. No one will ever observe it.

6