lyndonashmore writes:
The paper is famous on forums because they are looking at supernovae Ia and ‘select’ or get rid of quite a large sample of supernovae. Why not include them all?
DUH!
because Type 1A supernova are a result of a very specific phenomenon which occurs with a specific energy, thus giving observers sort of a standard candle. They all have the same light output and so you can calculate distance using the luminosity of the supernova
But, being a physicist, you already knew that.
buzsaw writes:
......and if the BB had never been invented an alleged expanding space would likely not have been concocted up, because the BB is just that - contrived.
Actually, you've got that backward.
(This is my ill-informed cartoon of events. Please correct me where I am wrong.)
Hubble saw all this redshift all over the place.
He very roughly showed that the redshift was proportional to distance.
(Distance that was measured by other means.)
He looked everywhere and saw just about every galaxy was redshifted.
He proposed that this might be due to the Doppler effect.
The conclusion from that is that galaxies are moving away from each other.
This implies that at some previous point all the galaxies were much closer to each other (but only if you extrapolate continouosly like creationists have done with the earth's magnetic field to say that it can't possibly be 4 billion years old).
Then, the theorists chimed in.
They looked at the equations of general relativity (without the cosmological constant) and said that space must either be expanding or contracting.
They then took this to say that the redshift is not only due to the relative velocity of the matter in galaxies, but also due to the expansion of space itself.
They also did some complicated extrapolations, and bang! we have the big bang theory.
So the BB theory is built on some serious assumptions that may or may not be correct, but they didn't just make it up.
Again, please don't kick over your chair if you want to correct me, just do it!
This message has been edited by gnojek, 03-23-2005 07:44 PM