home observation science solar system stars our galaxy cosmology astrobiology exoplanets astrophotography
icon Introduction
icon Astronomy Tools
1. Electromagnetic Spectrum
2. Atmosphere Limitations
3. Space Observations
1. Telescopes
2. Radio
3. Space Tools
4. Photography
5. Spectroscopy
6. Computers
7. Advanced Methods
8. Radio Astronomy
icon Basic Mathematics
Scientific Notation
Log Scales
icon Physics
- Basic Units of Measure
- Mass & Density
- Temperature
- Velocity & Acceleration
- Force, Pressure & Energy
- Atoms
- Quantum Physics
- Nature of Light
- Brightness
- Cepheid Rulers
- Distance
- Doppler Shift
- Frequency & Wavelength
- Hubble's Law
- Inverse Square Law
- Kinetic Energy
- Luminosity
- Magnitudes
- Convert Mass to Energy
- Kepler & Newton - Orbits
- Parallax
- Planck's Law
- Relativistic Redshift
- Relativity
- Schwarzschild Radius 
- Synodic & Sidereal Periods
- Sidereal Time
- Small Angle Formula
- Stellar Properties 
- Stephan-Boltzmann Law
- Telescope Related
- Temperature
- Tidal Forces
- Wien's Law
icon Computer Models
icon Additional Resources
1. Advanced Topics
2. Guest Contributions
Physics - Constants

Much of the groundbreaking work in physics has allowed the results to take the form of constants. Certain values - like the speed of light for example - are relatively unchanged and can safely integrate themselves into new problems to be solved.

The list of constants given here are the ones used mostly by Astronomers. A complete list of physical constants is available from the Physics Laboratory of the National Institute of Standards and Technology.

In addition to constants, I have also integrated some useful quantities as well.

Name: Symbol: Value:
Astronomical Unit A.U. 1.496 x 1011 meters
Atomic Mass Constant mu 1.6605386x10-27 kg
Boltzmann Constant k 1.3806505x10-23 J K-1
Electron Volt eV 1.60217653x10-19 J
Gravitational Constant G 6.6742x10-11 m3 kg-1 s-2
Gravity Constant Over h-bar G/ħ c 6.7087x10-39 (GeV/c2)-2
Light Year ly 9.4605x1015 m
Mass of Proton mp 1.67262171x10-27 kg
Mass of Neutron mn 1.67492728x10-27 kg
Mass of Electron me 9.1093826x10-31 kg
Mass of Hydrogen Atom mH 1.6735x10-27 kg
Parsec pc 3.0857x1016 m
Planck Constant h 6.6260693x10-34 J s
Planck Constant over 2π ħ 1.05457168x10-34 J s
Rydberg Constant R 6.6x10-12
Solar Mass 1.989x1030 kg
Solar Radius 6.9599x108 m
Solar Luminosity 3.90x1026 W
Speed of Light c 299,792,458 m s-1
Standard Atmosphere   101,325 Pa
Stefan-Boltzmann Constant σ 5.670400x10-8 W m-2 K-4
Wien Displacement Law b 2.8977685x10-3 n K
Year - Earth   365.2564 days
Year - Earth   3.156x107 sec

Back to Top


Search | Site Map | Appendix
©2004 - 2024 Astronomy Online. All rights reserved. Contact Us. Legal. Creative Commons License
The works within is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.