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Considering that the more distant an object is the smaller the angle it will make why would parallax measurements be better suited for stars than for galaxies?
Wiki User
∙ 15y ago
At larger distance, the parallax becomes smaller, and therefore harder to measure. Even the closest star (Toliman) has a parallax of less than one arc-second (1/3600 of a degree), which is difficult to measure. Stars that are farther away have a much smaller parallax.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoAt farther distances, the parallax becomes too small to measure accurately. At a distance of 1 parsec, a star would have a parallax of 1 second (1/3600 of a degree). (The closest star, Toliman, is a little farther than that.) At a distance of 100 parsecs, the parallax is only 1/100 of a second.
Wiki User
∙ 15y agoGalaxies are considerably farther away than the stars in our galaxy.
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The visible part of distant galaxies is the galaxies'?
Stars
The apparent shift in the position of nearby stars when compared to distant stars is?
Doug Fany answer: Parallax
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.
Scientists believe that the more distant galaxies formed?
the answer is "first".
When astronomers study distant galaxies they notice changes to the waves they observe describe the change to the waves they observe?
Because the universe as a whole is expanding, distant galaxies are moving away from us. As a result, electromagnetic waves emitted by those galaxies experience what is known as a red shift. Their wavelengths get longer.
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.
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
The visible part of distant galaxies is the galaxies'?
Stars
The visible part of distant galaxies is the galaxies what?
The "nucleus".
The apparent shift in the position of nearby stars when compared to distant stars is?
Doug Fany answer: Parallax
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
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?
Why do scientist study the light coming from distant galaxies?
They study distant galaxies because they want to know whats out in other galaxies and how many planets it has
Quasars are thought to be the center of distant?
galaxies
The fact that the light from distant galaxies is red-shifted suggests that the galaxies are?
Moving away from us
How do the distant galaxies ussually move?
Away from us.
