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Science and Technology "Somewhere, something incredible is waiting to be known." - Carl Sagan.

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Old July 28 2014, 06:14 PM   #16
PurpleBuddha
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Re: Colliding universes?

publiusr wrote: View Post
I was familiar with the Champagne Supernova before any of the recent documentaries.

As per the wiki on the Chandrasekhar limit...."they point out that this observation poses a challenge to the use of type Ia supernovae as standard candles."

http://en.wikipedia.org/wiki/Chandrasekhar_limit

Pulsars were first called LGMs (Little Green Men) because it fooled folks into thinking it might be artificial--for a little, that is.

The universe is pretty good at throwing monkey wrenches into theories--that was my point.
No doubt about the monkey wrenches it throws our way. But regarding the "champagne supernova" it never fooled researches into thinking it was a regular Ia. They knew it was different from the beginning.

Edit to add: Spitzer also confirmed the measurements using a different ruler:

The Spitzer measurement of the Hubble Constant was made by observed pulsing stars called cepheids at various distances from Earth. These stars' distances can be calculated by timing their pulsations, which are related to their inherent brightness.

The Hubble study looked at a special class of supernovas, which are also useful distance indicators, to make its calculation of the universe's expansion rate.

Both measurements have about the same estimated error margin of 3 percent. The Spitzer team calculated that the universe is expanding at about 74.3 kilometers (46.2 miles) per second per megaparsec (a megaparsec is roughly 3 million light-years). The Hubble team's measurement last year came up with 73.8 kilometers (45.9 miles) per second per megaparsec. The two values agree with each other within their error bars...
http://www.space.com/18028-universe-...orrection.html

http://www.nasa.gov/mission_pages/sp...r20121003.html

Last edited by PurpleBuddha; July 28 2014 at 07:31 PM.
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Old August 2 2014, 08:53 PM   #17
publiusr
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Re: Colliding universes?

I wonder what other surprises the universe has in store for us...
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