New 10 Terapixel Image of the Night Sky Contains 1B Galaxies

Re:New 10 Terapixel Image of the Night Sky Contains 1B Galaxies by kstrauser on Monday February 08, 2021 @09:39PM (#26073264)

1. No. We haven’t found large scale curvature of the universe yet. If it’s curved such that you could eventually see yourself from behind, it’s way more than 13 billion light years around.

2. See 1.

[ Parent | on HN ]

Re:New 10 Terapixel Image of the Night Sky Contains 1B Galaxies by soheil on Monday February 08, 2021 @10:02PM (#26073367)

I think you answered 2 first. Someone mentioned this link so I just wanted to post it again [0].

Regarding the first question why can't there be a planet let's say in Andromeda with a lake that would reflect back the light from our galaxy? That's only 2.5 million lightyears x 2.

[0] https://physics.stackexchange.com/questions/52167/since-ther...

[ Parent | on HN ]

Re:New 10 Terapixel Image of the Night Sky Contains 1B Galaxies by labawi on Monday February 08, 2021 @10:27PM (#26073490)

Didn't do the calculation, but I don't think you would get any meaningful light back.

[ Parent | on HN ]

Re:New 10 Terapixel Image of the Night Sky Contains 1B Galaxies by kstrauser on Monday February 08, 2021 @10:20PM (#26073448)

Oh, oops. I somehow managed to completely misread that question.

[ Parent | on HN ]