How close is Earth to the closest black hole?

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  • #76
Buzz Bloom
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You cite 0.54 M☉ as the MW mean, but does that closely match the mean for the stars in the local neighborhood, 12 LY?
Hi JMz:

That's a good question, but I will need a break for a while before I can explore it.

The list of the 33 stars with their characteristics is in
http://www.atlasoftheuniverse.com/12lys.html .
The data I use to arrive 0.54 is in
https://en.wikipedia.org/wiki/Stellar_classification .

If you have the time you might get the characteristics for each of 33 stars, and look up the mass for each type, and calculate their average mass.

Regards,
Buzz
 
  • #77
JMz
329
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Hi JMz:

That's a good question, but I will need a break for a while before I can explore it.

The list of the 33 stars with their characteristics is in
http://www.atlasoftheuniverse.com/12lys.html .
The data I use to arrive 0.54 is in
https://en.wikipedia.org/wiki/Stellar_classification .

If you have the time you might get the characteristics for each of 33 stars, and look up the mass for each type, and calculate their average mass.

Regards,
Buzz
A quick check: Another link on the first page you listed is http://www.atlasoftheuniverse.com/nearstar.html, which gives spectral class and lists them in order of distance. The ones closer than 12 LY (and even the rest within 20 LY) are overwhelmingly class M or sometimes K. These are all low-mass stars (no red giants to complicate the relationship to spectral class). So I do believe that they are typical of the average mass in the MW, about 1/2 solar.
 
  • #78
But I really hope Proxima Centauri implodes oh itself and becomes a black hole soon
That should make my field of science much more interesting
 
  • #79
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It won't. Proxima Centauri will live for many billion years and then become a white dwarf.
 
  • #80
JMz
329
78
It won't. Proxima Centauri will live for many billion years and then become a white dwarf.
In fact, this suggests a time scale that greatly understates Proxima's lifetime. It is estimated that it will last 5 to 10 trillion years. (And no black hole, ever.)
 

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