Denebola hr diagram

Three thoughts come to mind when looking at this:
1) How amazing is it that we can detect neutrinos?
2) It makes sense why we have no experiments that can test string theory, since strings are orders of magnitude smaller than neutrinos.
3) Being able to visualize such huge objects in the finite space of a flash animation is what makes mathematics amazing. I’ve thought about doing a similar animation to this one, but with the Mandelbrot fractal in the background and zooming in past the Planck length; it doesn’t exist physically, but the fractal keeps going.

  1. The Sun. (Hint: it has Luminosity of 1 and Radius of 1.)
  2. Mira, the reddest star, being a long period variable giant.
  3. Procyon, an F5 star slightly above the main sequence.
  4. Rigel, the most luminous star listed.
  5. Altair, a white (A7) star right on the main sequence.
  6. Capella, a yellow giant.
  7. The three belt stars of Orion being the hottest and bluest stars.
  8. Aldebaran, a "red giant" that is really orange, being spectral type K5, and brighter and larger than other orange giants.
  9. Mirfak (head of Perseus), being an F-type supergiant.
  10. Fomalhaut, the nearest in size to the sun.
  11. Delta Cepheid, the classic Cepheid, being a G0 supergiant.
  12. Polaris, also a cepheid, but with a shorter period than Delta Cephei, and hence near it in the diagram but slightly less luminous.
  13. Sirius, the nearest star included, an A0 star just below the main sequence.
  14. Betelgeuse, the largest red supergiant.
  15. Alcyone, brightest of the Seven Sisters (Pleiades) is a B7 giant, about 10 times the radius of the sun and 1,000 times as luminous.
  16. Deneb, the most distant star first magnitude star, second in luminosity only to Rigel.
  17. Arcturus, the middle of the three orange giants numbered, both in size and luminosity.
  18. The star closest to having exactly 100 times the radius of the sun.
  19. Regulus, type B7, being the bluest star falling exactly on the main sequence.
  20. Spica, bluer than Regulus, a B1 main sequence star.
  21. Antares, red supergiant second in radius only to Betelgeuse.
  22. Vega, an A0 star exactly on the main sequence.
  23. A star greater than 1,000 times the radius of the sun.
  24. Pollux, the smallest of the three orange giants.
  25. The smallest star listed.

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Note the scales are a bit different, so that the habitable zones of the Sun and of HD 40307 line up better (remember, HD 40307g is actually closer to its star than Earth is to the Sun – an AU is the distance of the Earth to the Sun, so HD 40307 is about AU from its star). What makes me smile is that the new planet is actually better situated in its "Goldilocks Zone" than Earth is! That’s good news, actually: the orbit may be elliptical (the shape can’t be determined from the types of observations made) but still stay entirely in the star’s habitable zone.

Denebola hr diagram

denebola hr diagram


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