Is Our Sun Part of a Binary Star System?

AI Thread Summary
The discussion centers on the possibility that the Sun may be part of a binary star system, as suggested by recent evidence. Participants express surprise that astronomers have not yet detected a potential companion star, raising questions about the thoroughness of astronomical surveys. The implications of discovering a binary companion could significantly enhance our understanding of the solar system's history. The conversation also references the Nemesis theory, which posits that a distant companion star could influence the solar system's dynamics. The topic highlights ongoing curiosity and debate within the astronomical community regarding the Sun's potential binary status.
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Interesting.

I think this'll tell us more about the history of our solar system than discovering a new star that is part of our solar system.
 
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...
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...
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