Newtonian Space and Time (plus Mach's Principle)

This is another snippet from my Cosmology lecture, based on Dr. Barbara Ryden's textbook "Introduction to Cosmology" Vol 2.

Here, I chat about Newton's version of space and time, as well as a deep digression into rotating buckets and empty universes with only pizza in them.

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[edd.]

Good evening everyone! I’m loving this class! Thank you!

[tradtke]

Hi Jason, I was wondering if the principle of isotropy in terms of galactic distribution also holds true for their orientation?

E.g., are there roughly the same number (and/or mass) of spiral galaxies with orbital planes close to the Milk Way's as there are galactic planes perpendicular to it (on either axis) and the various combinations thereof?

I'd presume it's the case, but is it something we have a solid answer for?

Also, if there is a roughly equal distribution, would this mean there net angular momentum of the universe is approximately zero? Was anything rotating at the big bang?

[radkonpsygami]

Hello Jason...saw quite a few videos of yours eventhough I'm not an astrophysics. I just wanted to know if you ever heard the following songs:

Uranus - by Nanowar of Steel (they have an astrophysics for a band member)

Quark Strangeness and Charm - by Hawkwind (a psychedelic British band popular in 1970s)

[juliavixen]

Oh, there is a funny, parenthetical, thing that Newton wrote (I forget exactly where) where he briefly considered that maybe time is not absolute... and then immediately following the idea he was like, "nahh..."

[stickinthemud]

I thought hydrogen, followed by helium, was the most common element in the universe. Yet the video I watched last night said that iron Iron 56 is.