Tell some differences between stars, planets and satellites ?

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 Stars (and essentially planets) won't move relative to each other in one night, they will move collectively across the sky because of the Earth's rotation. (Planets will technically move amongst the background stars, but you would not notice their relative movement unless you observed on a night to night, or week to week basis, you will not notice thier relative motions to the "fixed" stars with the naked eye in one observing session). 

They also both are capable of twinkling, I have seen planets twinkle when they are very close to the horizon, but for the most part, you will only see the stars twinkle. (For a deeper explaination, look up the term "scintillation").

Satellites move steadily across the sky. You will only usually see them the first couple of hours after sunset or the last couple of hours before sunrise. If you think you see one at "midnight" you are either at a very high latitude during your hemisphere's summer, or you are mistaken. Satellites (unless they are "tumbling" rocket payloads or irridium flares) will have a consistent brightness until they fade out (usually because the angle of sunlight reflection gets poor for the observer, or they enter the earth's shadow). They will not change direction or speed, but sometimes you could be decieved into thinking the latter happens because of the 3-D angle you are looking at it. A satellite is usually only visible for about 30 seconds - 3 minutes, before it's orbit takes it to a location to where it cannot reflect sunlight to a stationary observer.

Planes will change direction (unless they are WAY up there, and just completely passing your town by). Have blinking lights. If they are low on the horizon, they might appear stationary for a couple of minutes, but will not remain in the same part of the sky for any considerable length of time.

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 star is a massive, luminous ball of plasma that is held together by gravity. The nearest star to earth is the sun, which is the source of most of the energy on Earth. Other stars are visible in the night sky, when they are not outshone by the Sun. 

planet is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of plantesmials.

In the context of spacelight, a satellite is an object which has been placed into orbit by human endeavor. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the moon.

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thanks to both.

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planets are those heavenly bodies which do not emit light.

and stars are those which emit light of their own and can be seen clearly on nights.

satellites are those which revolve around the planets. a satellite can be of 2 types- natural & manmdae



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star is a spinning ball of hot,luminous gas . most of them are made of helium and hydrogen

planets range enormously in size and structure , these are spheres of gas solids and liquids lurk below their thick atmospheres 

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