Yes, MANY.
YeS, numerous solar systems actually.
Not in our solar system. Nor have any been found elsewhere to date.
Yes, the planet Earth is part of the solar system, so all the life on Earth is in the solar system. Yes, our Earth is part of the Solar System. As to life on other planets - both within our Solar System and in other solar systems (planets around other stars), nothing has been proven yet, one way or the other. Specifically, no life has been found on other planets. It would seem probable, though, that what happened on Earth can happen again - perhaps on nearly any planet, perhaps only occasionally.
No alien life has been found so far; either inside or outside our Solar System.
It is so large that it has never been lost.
The Sun
No new gas giant planet has been discovered in our solar system.
It has been suggested that comets originate in the Oort cloud and then travel in long elliptical orbits around the Sun.
Name the planets that do not exist in the solar system
Jupiter is the biggest planet in the solar system. However there have been 'super Jupiters' found orbiting other stars.
Planets found outside our own solar system are called exo-solar planets or exoplanets. These are in orbit around other stars. It's ver difficult to detect them due to the distances involved, but with modern techniques, over 500 have been confirmed.