Neil deGrasse Tyson
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Appearances Over Time
Podcast Appearances
Which I'm told is a quarter mile from the surface of the sun.
I was in Phoenix one time, for my first time, and the sun came out, and I said, oh, this is a beautiful day, the sun is out.
No one is in the streets, no one is in the parks, and when they walk in the streets, they walk on the side of the street that's shadowed, and they only follow shadows around.
The universe is not pancake shaped.
No, but to the point, galaxy motions are mostly random.
And what I mean by random is they're not coordinated in some big way unless you're part of a galaxy cluster.
And then there's some ballet of movement.
However, some structures in the universe are so large that the average speed...
of the galaxy moving among other galaxies in that cluster is insufficient for the galaxy to have made one complete loop through that cluster.
So that has significant consequences to what's going on there.
It's called, it's not virulized.
A virulized cluster is a cluster that has a very mature shape where, like a beehive, all the galaxies are moving around.
You step back, it has a spherical kind of envelope that contains them.
But if it's kind of ratty, like that, it's not yet virulized.