coreyspowell, 1 month ago Two space questions I hear a lot: Is Betelgeuse about to explode? When we see things happening "now" in deep space, didn't they really happen a long time ago? I decided to answer them both together (and threw in a bonus discussion about false precision). https://quanta.quora.com/Betelgeuse-is-642-5-light-years-away-the-light-we-see-from-it-is-642-5-years-old-How-do-Scientists-know-it-is-going-to-6?ch=10&oid=1477743753967765&share=6c715101&srid=u5Hxq&target_type=answer #science #space #astronomy #education
Two space questions I hear a lot:
I decided to answer them both together (and threw in a bonus discussion about false precision).
https://quanta.quora.com/Betelgeuse-is-642-5-light-years-away-the-light-we-see-from-it-is-642-5-years-old-How-do-Scientists-know-it-is-going-to-6?ch=10&oid=1477743753967765&share=6c715101&srid=u5Hxq&target_type=answer #science #space #astronomy #education
_thegeoff, 1 month ago @coreyspowell A favourite bugbear of mine, when I'm asked a similar question I tend to answer in terms of "there-and-then is the same as here-and-now for anything travelling at c" as a quick and dirty version of the GR perspective.
@coreyspowell A favourite bugbear of mine, when I'm asked a similar question I tend to answer in terms of "there-and-then is the same as here-and-now for anything travelling at c" as a quick and dirty version of the GR perspective.
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