Jupiter Neptune
The planet that most extrasolar planets resembles Jupiter.
Jupiter(apex)
Most of the confirmed Exoplanets are larger gaseous planets with large masses. These are easier to detect and confirm due to their size. They most resemble Jupiter, although many are thought to be much larger than our largest planet.
Mars
The inner planets such as Mars, Earth or Mercury. these are too small to identify in other systems and too close to the star.
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.
Gas and dust in a nebula is disturbed by an outside force
Not nuclear, it takes an extremely hight temperature for Fusion to occur with in the sun or any other star.
ADDED: Yes "nuclear". Fusion is one of the two type of nuclear reaction, the other being Fission.
That it is Saturn's biggest moon and it has an atmosphere.
All the inner planets are terrestrial planets.
A solar nebula is related to the formation of our Solar System, any other nebula is just a nebula.
star of one stellar mass, red giant, planetary nebula, white dwarf
light from the they orbit makes it difficult to locate extrasolar planets with telescope
Distant stars give off less light