英和和英

出典:『Wikipedia』 (2011/06/09 22:53 UTC 版)

英語による解説

引用

The free-fall time is the characteristic time that would take a body to collapse under its own gravitational attraction, if no other forces existed to oppose the collapse. As such, it plays a fundamental role in setting the timescale for a wide variety of astrophysical processes—from star formation to helioseismology to supernovae -- in which gravity plays a dominant role.