Mainly because of the vast distances to these objects, and their relatively small size.
Although our best telescopes can see structures like galaxies in very fine detail, observing a planet-sized object even within our own galaxy is extremely difficult.
Light from the stars they orbit makes it difficult to see them.
No. I don't believe any planets have been detected outside of our Galaxy. Within our Galaxy, planets are detected by inference not visual techniques. See link for lists of known extrasolar planets
We tend to see the large planets farthest away from their stars. So it is unlikely we will find any small planets close to their star similar to Mercury.
because soem planets are to far away and our eyes cant see that far
An extrasolar planet, or exoplanet, is a planet beyond our Solar System, orbiting a star other than our Sun. As of June 2009[update], 353 exoplanets are listed in the Extrasolar Planets Encyclopaedia . See http://exoplanet.eu/catalog-RV.php Most are unintelligible alphanumeric combination which are derivatives of the code assigned to the star in that "solar" system.
The seasonal variations of temperature on any planet depend on the characteristics of the planet's orbit, atmosphere, and axial tilt. Extrasolar planets are not all the same and appear to come in even greater variety than what we see in our solar system.
Most known extrasolar planets least resemble Earth due to their extreme characteristics such as being extremely close to their parent star, having very short orbital periods, or being much larger than Jupiter. These differences make them fundamentally different from Earth in terms of habitability and physical properties.
Antarctica can see the planets so well as there is no smoke or gas polluting the air s you can see into space were as in other places in the world you cant see through the smoke and gas in the air!
because it your blind spot
because the sun is so bright that it covers it up!! jk idk
Planets are considerably smaller than their parent stars, also they emit no light and are very close to the star. With all this combined, separating between the two with a telescope is very difficult.
Normally the term "Solar System" refers only to our system of Sun, planets and other stellar "stuff". Outside of "our Solar System" we use the term "Extrasolar Systems" Our nearest extrasolar system is Alpha Centauri and it is the closest star system to the Solar System, being only 4.37 light years away from our Sun. See link for more information