- vCommons Home
- Seager Equation

# Seager Equation

Not Reviewed

Equation / Last modified by EmilyB on 2016/07/29 13:39
`N = `

Seager Equation

Variable | Instructions | Datatype |
---|---|---|

`(N_*)"number of stars observed"` | Enter number of stars observed | Decimal |

`(F_Q)"fraction of stars that are quiet"` | Enter fraction of stars that are quiet | Decimal |

`(F_(HZ))"fraction of stars with rocky planets in the habitable zone"` | Enter fraction of stars with rocky planets in the habitable zone | Decimal |

`(F_O)"fraction of those planets that can be observed"` | Enter fraction of those planets that can be observed | Decimal |

`(F_L)"fraction of planets that have life"` | Enter fraction of planets that have life | Decimal |

`(F_S)"fraction on which life produces a detectable signature gas"` | Enter fraction on which life produces a detectable signature gas | Decimal |

Type

Equation

Category

vCommons

Contents

6 variables

Tags:

Rating

ID

EmilyB.Seager Equation

UUID

77d3f6dd-558d-11e6-9770-bc764e2038f2

The **Seager Equation** is a parellel version of the Drake Equation to estimate the number of habitable planets in the galaxy. Instead of aliens with radio technology, Seager has revised the Drake equation to focus on simply the presence of any alien life detectable from Earth. The equation focuses on the search for planets with biosignature gases, gases produced by life that can accumulate in a planet atmosphere to levels that can be detected with remote space telescopes. The formula is: `N=N_.*F_Q*F_(HZ)*F_O*F_L*F_S`, where:

- `N` = number of planets with detectable signs of life
- `N_*` = number of stars observed
- `F_Q` = fraction of stars that are quiet
- `F_(HZ)` = fraction of stars with rocky planets in the habitable zone
- `F_O` = fraction of those planets that can be observed
- `F_L` = fraction of planets that have life
- `F_S` = fraction on which life produces a detectable signature gas

## References

Wikipedia (https://en.wikipedia.org/wiki/Sara_Seager)