Starship Asterisk*

In this 90 degree panoramic, is there a part looking in the opposite direction from the galactic center? If not, has APOD published one before? Also, could APOD publish pictures looking straight down and straight up from our galactic position? Maybe I've already seen those but don't recall them ever...

Since these represent some of the oldest in the galaxy and the stars are relvatively close together - far closer than the stars in our neighborhood - I have to wonder about the forms of life that might exist within these clusters. If life forms there have evolved and survived, might their proximity ...

Believe it or not, I do have a slight understanding of the point you are making. I have an undergrad degree in math although I have forgotton most of it by now. I do remember some odd concepts dealing with curved spaces and I assume that is along the lines of what you are saying. I will however not ...

So is there a quantum difference between what we term "visible" universe vs. "observable" universe or are they essentially the same? I don't mean to belabor the point but this term "observable" is new to me and I'm trying to understand its relationship to "visible&...

Thanks Bystander. I had heard the term "observable universe" before but had assumed it to be the same as "visible universe". I read the Wiki entry on it and now know them to be different terms. An observable ball with a diameter of 93 billion light years is quite a concept. I agr...

In Lecture 1, the size of the visible universe is stated as 13.7 billion light years and that is further identified as a "radius" measurement. That prompted a few questions for me which Professor Nemiroff suggested I post in the Asterisk Bulletin Board for all to consider: 1. Is it correct...