Basics of Physics

Hawking Radiation

Some typical lengths in the universe

Standard Kilogram Metal The international standard kilogram   is the metal object carefully enclosed w ithin these nested glass containers.  

Universe and Time A new theory proposes that time is a fundamental property of the Universe governed by an oscillator that interacts with all matter and energy. Theorists have determined 10^(-33) seconds as the upper limit for the period of a universal                      oscillator, which could help in constructing a quantum theory of gravity.                                                                                                                                        –Katherine Wright Katherine Wright is a Senior Editor of Physics.