- #1

marcus

Science Advisor

Gold Member

Dearly Missed

- 24,738

- 788

An astronomy prof who teaches at a University in Iowa

maintains a resource page of online astro java applets

for students and general public to use

and one of the applets is "cosmology calculator"

http://www.earth.uni.edu/~morgan/ajjar/Cosmology/cosmos.html [Broken]

Here is her homepage

http://www.earth.uni.edu/smm.html [Broken]

If you try out the "cosmology calculator" and want it to give mainstream consensus answers similar to Ned Wright's and so on, then leave the Hubble parameter 70 (the default)

and put 0.27 in for the matter density ("omega")

and put 0.73 in for the cosmo. const. ("lambda")

Then every time you put in a redshift z (like z = 6.4 for a recently observed quasar) and press "calculate" it will tell you

how far away the thing was when it emitted the light we are now receiving from it

how far away it is now

how fast it was receding from us when it emitted the light we are now receiving

maintains a resource page of online astro java applets

for students and general public to use

and one of the applets is "cosmology calculator"

http://www.earth.uni.edu/~morgan/ajjar/Cosmology/cosmos.html [Broken]

Here is her homepage

http://www.earth.uni.edu/smm.html [Broken]

If you try out the "cosmology calculator" and want it to give mainstream consensus answers similar to Ned Wright's and so on, then leave the Hubble parameter 70 (the default)

and put 0.27 in for the matter density ("omega")

and put 0.73 in for the cosmo. const. ("lambda")

Then every time you put in a redshift z (like z = 6.4 for a recently observed quasar) and press "calculate" it will tell you

how far away the thing was when it emitted the light we are now receiving from it

how far away it is now

how fast it was receding from us when it emitted the light we are now receiving

Last edited by a moderator: