Asteroid dimension

The Asteroid dimension more commanly called the Alternate dimension is a dimension as the name suggests filled with mostly asteroids, Black holes, and dimensional portals. In the final battle of Ratchet & Clank Future: Tools of Destruction, Ratchet is pulled into this dimension by Tachyon whom he thought was dead when he was sucked in. The final battle continued in this dimension untill Ratchet destroyed Tachyon's thrown, where tachyon feel to the ground and told ratchet he new his purpose and real name. He then told ratchet his kind would never be safe and was then sucked in by a black hole. Ratchet & Clank then use the Dimensionator to get back to their dimension. Tachyon most likely survived because he has teleportation powers and if he is alive he would probably be stuck in the dimension, the black hole could have also teleported him somewhere.

Triva

 * It is speculated that the black hole tachyon feel into teleported him into another dimension, maybe the Lombax dimension, if he still has his thrown he could change it into a dimensionator like thing and if it worked it would be a matter of time before tachyon got out. This is pure speculation though.

Apperences
Ratchet & Clank Future: Tools of Destruction