Radius of observable universe from Earth: 300,000,000 light-years.*
Probable diameter of total universe: 6,000,000,000 lightyears.
Number of nebulae (star galaxies) in observable universe: 100,000,000.
Probable number of nebulae in total universe: 500,000,000,000,000.
Mass of an average nebula: 800,000,000 times that of the sun.
Such cosmological calculations, offspring of the most respected modern theory and the most searching observation, were slapped down before members of the National Academy of Sciences (enrolment: 300) assembled in Washington last week. The figures were fairly safe ground for the man who presented them, Dr. Edwin Powell Hubble, famed astronomer...
