Abstract:
The term “black hole” conjures up many fanciful images, some of which are false, and, surprisingly, many of which are true. To astronomers,”black hole” actually means two different things: first, the theoretical construct predicted by General Relativity (GR), and second, the objects in space that we have observationally confirmed; there is a subtle, at least semantic, difference. For a long time, we’ve known of black holes that are several to about ten times the mass of the Sun, observed as X-Ray sources in our Galaxy. We’ve also known about black holes that are millions to billions times the mass of the Sun, lurking at the cores of galaxies. In the last few years, thanks to gravitational wave observations, we’ve confirmed black holes that are thirty times the mass of the Sun. Are there any in between? Do black holes hundreds or thousands the mass of our Sun exist? If so, where are they hiding? In this talk, I’ll outline our current knowledge of where black holes exist in the Universe, and mention some of the remaining questions we have about these exotic objects.
https://en.wikipedia.org/wiki/NGC_4261
これはブラックホールについての講演ですね。
返信削除観客に交じって鹿もいるのでは。
中性子星や銀河の中心についても述べていますね。
ブラックホールの具象化・可視化についての
削除講演でした。最も興味深かったのは8.9.10枚目の
スライドに見られるように目の前に立体物を
出しての説明のところで、観客にも大うけでした。