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Originally posted by Wrabbit2000
:-)
Originally posted by inverslyproportional
reply to post by Wrabbit2000
I was simply trying state things we do know to be facts. As we have tested and applied the knowledge in the real world ie. The probes that have passed harmlessly turough these regions, without fear of anything hitting anything.
What probes have left our Solar System to pass through any regions that aren't essentially in our own tiny backyard? Voyager I just left the sphere, as I understand it and it's the first (known) human object to ever leave our own home turf. So.....everything beyond that is still based on observation, assumption based upon what that shows, and presumption based only upon what has been observed within our own solar system, right?
* BTW .. Nothing is personal. I hope it's not seen that way. I reply to topics, not people ..even if it is a bit energetic regarding the topic at times.
We also have a distance measure to check these guesses, which have proved very accurate, thus we have learned to use more than one method to determine distances.
It is called a standard candle. It based on the ract right here on earth I can guess your distance quite accurately, with nothing but a light source of known power.
A type 1A supernova is this standard candle, it always explodes with the exact same strength and luminosity. So it is possible check our assumptions against a known quantity, to double check and if necessary revise our figures.
Originally posted by GaryN
reply to post by inverslyproportional
We also have a distance measure to check these guesses, which have proved very accurate, thus we have learned to use more than one method to determine distances.
It is called a standard candle. It based on the ract right here on earth I can guess your distance quite accurately, with nothing but a light source of known power.
A type 1A supernova is this standard candle, it always explodes with the exact same strength and luminosity. So it is possible check our assumptions against a known quantity, to double check and if necessary revise our figures.
The red/blue shift thing is still not settled by any means, and plasma around a star, or even a very strong electric field has to be considered too. The standard candles have also been shown not to be foolproof.
Cosmology Standard Candle not so Standard After All
www.nasa.gov...
'Standard candle' flickers too brightly
physicsworld.com...
Why do we see distant stars?,
Originally posted by AllIsOne
I.e. Hipparcos 5926 in Cassiopeia is 16,308 light-years away. One light year is 9.4607 × 10*12 km. How come we can see that star without any major flickering? Seeing a star means that the light traveled an almost unimaginable distance without being absorbed, or blocked along the way. I feel the photons should have hit something along the way, i.e. planets, gasses, suns, space debris, etc.. The universe is full of moving objects. Yet, we see that star continuously shinning at night?
Can You See Stars in Space? Is it true that in space a person is not able to see stars all around them like we do here on Earth? No, I hear that in space the stars look wonderful, bright (although not twinkling) and very clear. What has probably caused some of this confusion is that in the typical photo or video image from space, there aren't any stars. This is because the stars are much dimmer than the astronaut, Moon, space station, or whatever the image is been taken of. It is extremely hard to get the exposure correct to show the stars. Luckily, the human eye handles the different light levels much better than a camera does.
Originally posted by wmd_2008
First of all, ALL the STARS you can see in the night sky with your eyes, binoculars and telescopes are in our own galaxy that fact seems to have escaped a few on this thread!!!
The only objects not in our galaxy are Large & Small Magellanic clouds and other Galaxies, other objects like star clusters , nebula etc are all in our Galaxy.
edit on 2-4-2013 by wmd_2008 because: (no reason given)
Originally posted by Wrabbit2000
I've wondered for awhile now if someday we're going to find out that looking out from Earth will end up being like a side view mirror in a car. "Objects may be closer than they appear". That would be both exciting and real sobering, wouldn't it?
Originally posted by AllIsOne
I.e. Hipparcos 5926 in Cassiopeia is 16,308 light-years away. One light year is 9.4607 × 10*12 km. How come we can see that star without any major flickering? Seeing a star means that the light traveled an almost unimaginable distance without being absorbed, or blocked along the way. I feel the photons should have hit something along the way, i.e. planets, gasses, suns, space debris, etc.. The universe is full of moving objects. Yet, we see that star continuously shinning at night?