What's the probability that two stars collide when galaxies collide? [with equations!]
Автор: Dr. Becky
Загружено: 2019-05-08
Просмотров: 152919
There are 400 billion stars in the Milky Way and a trillion stars in Andromeda - so what's the probability that any of those stars will collide when the Milky Way and Andromeda merge over 2 billion years in the future?
With such numbers, you might think the probability is pretty high but there's also a lot more empty space than there are stars...
My main camera tried its best this week on face auto-focus but it didn't do so well. Please forgive its failings. And before you ask, I don't own a whiteboard.
Majewski et al (Sagittarius A stream paper): https://ui.adsabs.harvard.edu/abs/200...
Chemistry 101 collisions of particles in a box: https://chem.libretexts.org/Bookshelv...
The Binomial Distribution: https://www.mathsisfun.com/data/binom...
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My sister made the frame in the background as a present when I passed my PhD.
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Dr Becky Smethurst is an astrophysicist researching galaxies and supermassive black holes at Christ Church at the University of Oxford.
Twitter: / drbecky_
http://drbecky.uk.com
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