Lec 5 | MIT 8.224 Exploring Black Holes

[Illuzionz1111]

I am viewer over 9k

[richachacha]

I watch this video just to understand what Sheldon and Leonard are talking about... :-)

[Seekingthings]

I am the viewer number 8000!!!! like it like !!

[BigMTBrain]

The discussion that begins at 20:00 (and, in fact, almost the entire lecture) is new information for me. Oh, how I admire those who have devoted their lives to contemplating and mathematically deriving possible and highly probable solutions to VERY BIG questions. Alan Guth is one such devotee and contributor to the concepts and study of cosmology.

[Goldtacto]

i dont think i could even sit still in this class knowing that guth is always on discovery channel

[ghostinthemean]

Definitely cool video. Changed the whole feel of my day up to that point. ...and that point. ...and that point.

[tallgum28]

great lecture....a lot easier to listen to

[BrutusBlackest]

Le roi est mort, vive Le Roi!

[seanmPWH]

the gravitational field thought experiment at 30: seems problematic because the radius of the mass has decreased and the gravitational field would become less dense, therefore no need to appeal to negative energy.

[miinyoo]

Consider this:

The earth is orbiting the sun as it does today, but one day the sun suddenly became a black hole. If the radius shrunk by a factor of 1000, where would the earth's orbit be?

Answer:

Exactly where it is.

The overall gravity falloff due to distance is related to the center of mass / gravity. Therefore, a mass's radius is irrelevant when calculating gravity between 2 bodies with unchanging distance between their centers of gravity.

[vital2mi]

Finally, one who presents with a sense of etiquette!!

[Onebodaciousdude]

whoa!!!!!! good vid!

umm LOL ahhehe UO

[PGGuderian]

Guth is very sympathic