Today on Crash Course Astronomy, Phil dives into some very dark matters. The stuff we can actually observe in the universe isn't all there is. Galaxies and other large structures in the universe...
========== A lot of people have noted that astronomy
is a humbling enterprise to pursue. After all, every time we make a new discovery, we
find ourselves further removed from importance. The Earth is but one planet among many, orbiting
a Sun that is one star among hundreds of billions, out in the suburbs of a galaxy that is one
among hundreds of billions more. It’s easy to feel pretty small when you
see all that magnificence out there. And we astronomers keep making it worse! Because
now we know that what we can see isn’t even everything there is. Normal matter, the stuff
that makes up you and me and all we observe in the Universe? That’s only a small fraction
of what’s actually out there. It’s time we talk about some very, very
dark matters. In the 1960...