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Why do planets seem to move in relation to earth while stars stay still?

2007-09-04 02:35:56 · 11 answers · asked by desperanzaa// 2 in Science & Mathematics Astronomy & Space

11 answers

The short answer is because they are much closer than the stars.

The planets are moving in their orbits around the Sun at different speeds and the stars are moving in their orbits around the galactic center at much higher speeds, but the stars are so far away that it takes hundreds of years for them to move far enough to change position noticeably as seen form Earth, while the planets are close enough that they change position very noticeably in just a few day or weeks.

2007-09-04 02:40:21 · answer #1 · answered by campbelp2002 7 · 5 0

See actually the relation to motion of earth and other planets is the gravitational pull that the sun attracts towards itself, and your question related to the motion of stars is that all STARS ARE SUN.its a fact.As the stars or we can call as the suns are very far away and so due to the great distance between them the light emitted by those sun are able to reach the earth but in a very small quantity due to the distance.One more fact is that the stars we see in the sky are actually not on the position we see them through naked eyes, this is because of the various layers present in the atmosphere.

2007-09-04 12:02:29 · answer #2 · answered by rock star 2 · 1 0

Actually both move if you were to lay on the ground and watch, the stars are much more 'fixed' relative to each other, as they are much further away than planets. Planets move relative to each other as they have different orbital veliocities (different distances from the sun, so inner planets orbit much faster than outer planets (Jupiter as an example, orbits about the sun once every 12 years while earth orbits 12 times) - the angular change for planets is thus much greater than even the closest star even though it might be moving about the same speed as Jupiter relative to Earth, If you had a very good camera taking pictures of the sky over a couple million years, you could see a lot of movement of the stars relative to us and relative to each other...

2007-09-04 09:44:36 · answer #3 · answered by Steve E 4 · 0 1

Because they ARE moving in relation to earth. All planets orbit the sun just like earth is. And like the moon is orbiting earth. The stars are also all moving but their relative speed compared to the planets is incredibly small and hard to notice even with sophisticated equipment. This is due to the huge distance to the stars.

2007-09-04 10:00:34 · answer #4 · answered by DrAnders_pHd 6 · 1 0

Stars do not stay still. Our galaxy is rotating relative to the centre just like our planets relative to the sun. Its just on a much larger scale.

2007-09-04 10:56:39 · answer #5 · answered by Anonymous · 1 0

It has to do with arc.

When they cover far more arcseconds of your vision than stars do in the same time period, they appear to move faster.

Just like a plane going 600 mph that is 20 miles away appears to be going far slower than a car right across the street going 60 mph.

2007-09-04 10:06:41 · answer #6 · answered by Anonymous · 0 0

2 Factors: Distance & Speed
Planets are MUCH closer and move faster.
Therefore their movement is much easier to notice.

Big ol' stars are MUCH further away than the planets in our solar system.

They move too. But because of the immense distances, and slower speed, this movement is much more difficult to notice.

2007-09-04 10:10:07 · answer #7 · answered by Joe H 6 · 0 0

The movement of stars is so slow the movement is hard to detect, but they do move in a circular motion around the north star, Polaris.

2007-09-08 13:07:13 · answer #8 · answered by johnandeileen2000 7 · 0 0

Planets move because of the suns gravitational pull. the stars are millions or billions of miles away, too far for the suns gravity to effect it.

2007-09-05 03:19:38 · answer #9 · answered by Deleted 2 · 0 1

Once a pinhole is there in the black sheeting (you call the night sky) the pinhole stays there. The planets move cause they are connected by plasma string to the sun so just go around and around till the battery wears out and then the sun goes out and they have to travel elsewhere to a new sun.

2007-09-04 10:21:29 · answer #10 · answered by Anonymous · 0 3

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