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Astronomy
- The study of the objects that lie beyond Earth and the process by which these objects interact with one another
- My definition: The study of celestial objects beyond Earth and how they interact with one another.
- An observational science
- Rarely setup traditional experiments
- Any hypotheses must be tested by observing many samples of the objects being studies
- We note how different samples vary
- Light is basically the only information we have access to
Resources
Useful Constants
Physical Constants
Name | Value |
---|---|
speed of light () | |
gravitational constant () | |
Planck’s constant () | |
mass of a hydrogen atom () | |
mass of an electron () | |
Rydberg constant () | |
Stefan-Boltzmann constant (σ) | |
Wien’s law constant () | |
electron volt (energy) () | |
energy equivalent of 1 ton TNT |
Astronomical Constants
Name | Value |
---|---|
astronomical unit () | |
Light-year () | |
parsec () | |
sidereal year () | |
mass of Earth () | |
equatorial radius of Earth () | |
obliquity of ecliptic | |
surface gravity of Earth () | |
escape velocity of Earth () | |
mass of Sun () | |
equatorial radius of Sun () | |
luminosity of Sun () | |
solar constant (flux of energy received at Earth) () | |
Hubble constant () | approximately 20 km/s per million light-years, or approximately 70 km/s per megaparsec |
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