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Answered 2008-05-05 23:23:38
Galaxies are considerably farther away than the stars in our galaxy.
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Why can't the parallax effect be used to measure distances to other galaxies?
The parallax angle of such distant objects is way too small to be measured. In general, the farther away an object, the smaller is its parallax angle.
Could you use parallax to measure the distance to distant galaxies?
No, the parallax would be too small to measure. With current technology, a parallax can be used up to a distance of about 1600 light-years - the farther away the start that is measured, the more inaccurate is the distance calculation.
What isTrigonometic parallax used to obtain distance to?
parsecs and arc seconds of one parallax to the distant background stars. it doesnt work very well across the intergalactic medium because there are no background stars outside of galaxies, so it mostly works to determine very far away distances within a galaxy or galaxies
Why do scientiss study distant galaxies?
They study distant galaxies because they want to know whats out in other galaxies and how many planets it has
Which has the larger parallax angle distant or nearby stars?
Nearby stars have a larger parallax angle.
The visible part of distant galaxies is the galaxies'?
Stars
Why do astronomers think that quasars represent an early stage of galactic evolution?
There are more quasars in faraway galaxies, i.e., in the distant past.There are more quasars in faraway galaxies, i.e., in the distant past.There are more quasars in faraway galaxies, i.e., in the distant past.There are more quasars in faraway galaxies, i.e., in the distant past.
How does parallax shift varies with distance?
The closer the star, the greater the parallax angle, which is why you can't measure the distance to very distant stars using the parallax method.
Why do scientists study distant galaxies to learn about galaxies?
cuz they are explorers
How can scientist learn about earlier galaxies by studying distant galaxies?
Depending upon how distant the galaxies are, in some cases it takes light billions of years to reach our planet from distant galaxies, which means that we are not seeing those galaxies as they are now, but we are instead seeing them as they were, billions of years ago. The more distant a galaxy is, the longer it takes for its light to reach us, and therefore the earlier the galaxy that we are observing.
What tells scientists about distant galaxies?
Images of distant galaxies are taken from powerful telescope. By studying its redshift, its distance is measured and we came to know about it.
Quasars are thought to be the center of distant?
galaxies
What is the distance to the stars less than 100 light years measured through?
We can't run a measuring tape out to the nearer stars, and it would take too long to bounce a radar pulse off of them (even if it would work!) so we have to use other, less precise measurements. For "nearby" stars - less than a couple hundred light years or so - we can measure their parallax. We take an observation of a nearby star and note the very distant background stars. We repeat that same observation 6 months later, when the Earth is on the other side of its orbit, and see the difference in the nearby star's position relative to the distant stars. This is called parallax, and a star that has a parallax shift of one second of arc is one "parallax-second of arc" - or one "parsec" - in distance. One parsec is approximately 3.26 light years. The limitations should be obvious. The more distant the star, the less the parallax shift, and at some point, we can't measure the difference accurately enough. We have to be sure to select "distant background stars" that are REALLY distant, and how can we know that they are really distant when all of our distance measurements are guesses to begin with?
The apparent shift in the position of nearby stars when compared to distant stars is?
Parallax
Explain why looking at distant galaxies gives scientists an idea about how galaxies change over time?
Light from distant galaxies took billions of years to reach us. Therefore, we are looking at the far past of the Universe.
How do the distant galaxies ussually move?
Away from us.
Where is the distant galaxy?
There are distant galaxies all around us - in all directions, and at varying distances.
Why is spring one of the best seasons to observe distant galaxies?
Because in the spring, the night sky is pointed out of the Milky Way and therefore it is easier to see distant galaxies.
What is the name for the apparent shift in position of distant objects due to motion of the observer?
parallax
The fact that the light from distant galaxies is red-shifted suggests that the galaxies are?
Moving away from us
What are 2 things astronomers do?
Observe distant stars and galaxies through expensive telescopesComplain that they don't get enough time on expensive telescopes to view distant stars and galaxies.
Why do scientists study distant galaxies to learn about early galaxies?
The further something is away form us the longer the light from it has been travelling to reach us. Thus when we look at very distant objects (galaxies) we see them as they were in the distant past when they were young. The more distant they are the younger/earlier they are. This effect is enhanced by the expansion of the universe which also makes the light from distant objects shift towards the red end of the spectrum.
Is a star with no measurable parallax is very close to Earth.?
No, if you can measure no parallax, the star is far away - further than a certain distance.
Scientists believe that the more distant galaxies formed?
the answer is "first".
Do distant galaxies rise in the east and set in the west?
yes
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