**Herong's Notes on Physics** - Version 3.21, by Dr. Herong Yang

List of Various Distances and Lengths

This section lists various distances and lengths to give us a sense of scale about space.

The list below provides some reference distances and lengths to give us a sense of scale about space:

8.6 ly - Distance to star Sirius 4.2 ly - Distance to Proxima Centauri, a nearest star 149,597,870 km - Average distance from Earth to Sun 4,366,813 km - Circumference of Sun 1,392,684 km - Diameter of Sun 384,403 km - Average distance to Moon 40,008 km - Length of the equator of Earth 12,742 km - Average diameter of Earth 3,475 km - Diameter of Moon 8.85 km - Height of Mount Everest 930 m - Height of the world's tallest building in Dubai 105 m - Length of a soccer field 3 m - Average wavelength of FM radio waves 12.2 cm - Wavelength of microwaves in a microwave oven 24.26 mm - Diameter a US Quarter 0.2 mm - Diameter of horsehair 680 nm - Wavelength of red light 260 nm - Length of the smallest transistor in Pentium 3 chip 17 nm - Diameter of a smallest viruses Porcine circovirus 10 pm - Wavelength of gamma rays 2.2 fm - Diameter of neutron 1 fm - Diameter of proton

*Last update: 2014.*

Table of Contents

Meter Based on Earth's Meridian

Meter Based on Seconds Pendulum

Meter Prefixes and Other Units

►List of Various Distances and Lengths

Introducion of Frame of Reference

Introduction of Special Relativity

Time Dilation in Special Relativity

Length Contraction in Special Relativity

The Relativity of Simultaneity