Stars are known to move around the poles, and also have their known Proper Motion. But it is often said the stars are fixed in comparison to the planets which rotate. It is the earth that is moving primarily which gives the illusion that the stars move also.
Yes, the stars move. Yet, because of their great distance, the motion across a small arc of sky must be measured in centuries or millennia.
The relative velocities of stars are on the order of tens of kilometers per second, but because stars are many trillions of kilometers distant, it could take centuries or millennia for any star to move 1 degree of arc, even if within a few light years.
The motion of all the visible stars in our night sky is one of orbiting the hub of our Milky Way galaxy. Not all follow the same path, so some are passing while others are being passed.
Scientists measure the motion relative to Earth as "proper motion" (delta Right Ascension and delta Declination) and "radial velocity" (toward or away from Earth. With these, you can calculate +/- XYZ vectors.
by tlmcgaa70 6 years ago
i am neither for or against Obama. but i am seriously getting tired of everyone blaming everything that goes bad on him. my step dad is a serious Obama hater and I hear almost nothing from him but how everything that happens in the news is his fault. tonight it was "kodak is filing for...
by Diane Minton 6 years ago
What do you think of when you look at the night sky, with stars of course?What do you think of, other planets, love? Your thoughts are the answer I am looking for.
by Dr. M Arsalan Zubair 3 years ago
If a newton says " In absence of external force every body will remain in its original state" then how people says that there is no God?Friends! In my above question which I have asked to the disbeliever that if you believe that there is no God then how these biggest mechanisms of the...
by Randy Godwin 6 years ago
How familiar are you with the night sky?Do you live--or have you ever lived--in a place where the sky is dark enough to become familiar with the different planets, constellations, nebulae,and individuals stars?
by Sneha Sunny 7 years ago
Not the cluster of stars but the star.
by Tim 8 years ago
any ideas?http://us.playstation.com/ps3/accessori … 98060.html
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