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Murdin
03 Path of the gods, souls and pilgrims
2018年8月9日木曜日
The Milky Way
Murdin
03 Path of the gods, souls and pilgrims
2018年5月14日月曜日
Perseus In Sicily 2018 May
http://www.ira.inaf.it/iaus342/
My presentation:
High energy resolution X-ray spectroscopy of the Perseus core with Hitomi
2018年5月10日木曜日
Tashiro, M. & Kelley, R. in Proc. Conf. ‘ e X-ray Universe’ 2017
(eds Ness, J.-U. & Migliari, S.) (ESA, 2017);
(eds Ness, J.-U. & Migliari, S.) (ESA, 2017);
2018年5月9日水曜日
2018年5月8日火曜日
2018年4月24日火曜日
2018年4月20日金曜日
Chapter 6 - Black Holes
The term black hole is of very recent origin. It was coined in 1969 by the American scientist John Wheeler as a graphic
description of an idea that goes back at least two hundred years, to a time when there were two theories about light:
one, which Newton favored, was that it was composed of particles; the other was that it was made of waves. We now
know that really both theories are correct. By the wave/particle duality of quantum mechanics, light can be regarded as
both a wave and a particle. Under the theory that light is made up of waves, it was not clear how it would respond to
gravity. But if light is composed of particles, one might expect them to be affected by gravity in the same way that
cannonballs, rockets, and planets are. At first people thought that particles of light traveled infinitely fast, so gravity
would not have been able to slow them down, but the discovery by Roemer that light travels at a finite speed meant that
gravity might have an important effect.
https://apod.nasa.gov/apod/ap170216.html
description of an idea that goes back at least two hundred years, to a time when there were two theories about light:
one, which Newton favored, was that it was composed of particles; the other was that it was made of waves. We now
know that really both theories are correct. By the wave/particle duality of quantum mechanics, light can be regarded as
both a wave and a particle. Under the theory that light is made up of waves, it was not clear how it would respond to
gravity. But if light is composed of particles, one might expect them to be affected by gravity in the same way that
cannonballs, rockets, and planets are. At first people thought that particles of light traveled infinitely fast, so gravity
would not have been able to slow them down, but the discovery by Roemer that light travels at a finite speed meant that
gravity might have an important effect.
https://apod.nasa.gov/apod/ap170216.html
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