Could Super Earths have formed in our solar system?

The reason we haven't found any Earth sized planets is because they are harder to detect. The two ways we detect planets are through transits and the "wobble" of a star- and a bigger planet makes each method easier. As for a super Earth in our solar system it is definitely possible and it could have been ejected,

The debris could be purely coincidence. Perhaps there was less material during the formation of our solar system. Maybe 8 planets orbiting a star is actually a "low" compared to other stars.

We've also been examining red dwarf stars instead of stars similar to our own simply because it's easier to detect planets around them so there's no reason to suspect them to have the same planet formation. However, the ejection of planets in the early solar system is quite possible even probable but it's usually the less massive objects that gets ejected. Note the Oort cloud are material ejected from the early solar system. Also a lot of material would've gone into the Sun.

No ...

Our solar system seems to be complete, with the mas of planets increasing to Earth

then Mars and Asteroid belt being smaller -- due to thenearness of Jupiter.

then the gas giant planets in decreasing size.

Plus there is no mechanism known that could eject an earth sized planet.

It could be argued that Uranus is a Super Earth -- at 14 earth masses. And in fact, it is thought that Uranus and Neptune exchanged places, which would account - at least in part - for the very high axial tilt of Uranus (98 degrees)

But any planet over 3 earth masses would be too large for life like us to exist there --

either :

1) the atmosphere would be too dense

or

2) surface gravity would be too high

or both

A ZonePlayer is a Sonos device that streams music for you to hear. It may have built-in speakers and be easy to move from room to room. Another ZonePlayer has a built-in amplifier to which you need only connect speakers. Another model connects to your home stereo (AV receiver) and streams the music through the stereo and speakers. For each room or area you want to play music, you need a ZonePlayer. Whatever model you choose, the Zone Player is where you hear the music from the Sonos system and can work with your current music setup or add to it.