Dark Matter Evidence, Oort Cloud Shape, Size of Lagrange Points | Q&A 229
Will LIGO detect gravitational waves when Betelgeuse explodes? Why are scientists so sure about dark matter? Could Betelgeuse become a black hole after it goes supernova? Why is the Oort cloud a sphere, not a disk? What determines the size of Lagrange points? All this and more in this week's Q&A!
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Dark Matter Evidence, Oort Cloud Shape, Size of Lagrange Points | Q&A 229 (Vimeo)
Comments (3)
I have a new question, not sure where to post it so I try here: all this news coming out about time going slower in the early universe confuses me. Do they mean the universe stretched and so what we observe now seems slower due to time dilation or did time really go slower at that post-bigbang era? How can we measure that, given the fact that time is relative as Einstein showed us long ago?
Kamino: oh dear Dark Matter again. It's not a theory nor an observation (who's seen it?) it's an inference from the observation of normal matter. The Sherlock Holmes principle.
Same question in another scale: why are most galaxies disks but globular clusters so stable - as balls?