A Is for Alpha Centauri

Here it is! It’s the Blogging from A to Z April Challenge! Two years ago, I participated in it, and now I’m doing it again. This time, I have a science theme, and I am featuring videos.

For the first topic, we have Alpha Centauri. Check out the video below. After the video, the facts are available for you to read.

  1. It’s a triple star system 4.37 ly from the sun.
  2. Alpha Centauri A is also known as Rigil Kentaurus, while Alpha Centauri C is known as Proxima Centauri. B has no other name.
  3. Alpha Centauri A is a G2 yellow dwarf star similar to the sun, although 10% brighter and 23% larger.
  4. Alpha Centauri B is a K1 orange dwarf star 90% the mass and 14% smaller radius than the sun.
  5. Proxima Centauri is an M6 class red dwarf star with 0.123 solar masses.
  6. Proxima Centauri orbits the AB pair at a massive distance of 15,000 AU or 0.24 light years, though it’s not completely certain it is a member of the system.
  7. Discovered in 2012, Alpha Centauri Bb was an extrasolar planet that was found in 2015 to be an artefact of data analysis. It doesn’t exist.
  8. In 2016, Proxima Centauri b was announced. It’s an extrasolar planet a bit larger than the earth, but is in the star’s habitable zone. It’s likely to be tidally locked, making life difficult to take hold. It’s also likely to be one of the easiest extrasolar planets to study in the near future because of it’s proximity.
  9. The Alpha Centauri system is estimated to be between 4.5 and 7 billion years old, around the same age of our sun or older.
  10. Due to Proxima Centauri being a flare star, life may never have a chance to become established on b because the flares may strip the planet of its atmosphere.

Coming on Monday is the letter B, which will have a more biological topic. Comments are always welcome!

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