The discussion highlights a picture representing the observable universe, emphasizing that while it visually captures a vast expanse, it primarily depicts objects within the Milky Way. The image does not encompass the entirety of the observable universe but includes a few distant objects that are nearly zero distance from the Milky Way. Participants express admiration for the image's quality, noting it effectively illustrates the concept of the observable universe. Questions arise regarding the picture's source and the method of its capture or generation. Overall, the conversation underscores the distinction between visual representation and the true scale of the universe.
#1
Kanov
2
0
The entire observable universe is contained rather graciously in this wonderful picture, for your admiration.
The entire observable universe may well be in the field of the camera's view, but it most certainly is not actually in the picture. Everything in the pic is in the milky way, with the possible exception a very small number of objects which are, in cosmological terms, approximately zero distance from the milky way.
#5
rootone
3,394
945
Nice picture, it definitely is a picture of what in ordinary language might be called 'observable', with a half decent set of lenses.
Is a homemade radio telescope realistic?
There seems to be a confluence of multiple technologies that makes the situation better than when I was a wee lad: software-defined radio (SDR), the easy availability of satellite dishes, surveillance drives, and fast CPUs.
Let's take a step back - it is trivial to see the sun in radio. An old analog TV, a set of "rabbit ears" antenna, and you're good to go. Point the antenna at the sun (i.e. the ears are perpendicular to it) and there is...
3I/ATLAS, also known as C/2025 N1 (ATLAS) and formerly designated as A11pl3Z, is an iinterstellar comet. It was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) station at Río Hurtado, Chile on 1 July 2025.
Note: it was mentioned (as A11pl3Z) by DaveE in a new member's introductory thread.
https://www.physicsforums.com/threads/brian-cox-lead-me-here.1081670/post-7274146
https://earthsky.org/space/new-interstellar-object-candidate-heading-toward-the-sun-a11pl3z/
One...
Partial solar eclipse from Twizel, South Isl., New Zealand ...
almost missed it due to cloud, didnt see max at 0710 NZST as it went back into cloud.
20250922, 0701NZST
Canon 6D II 70-200mm @200mm,
F4, 100th sec, 1600ISO
Makeshift solar filter made out of solar eclipse sunglasses