  Mirror matter is an entirely new form of matter predicted to exist if mirror
symmetry is a fundamental symmetry of nature. Mirror matter has the right broad
properties to explain the inferred dark matter of the Universe and might also
be responsible for a variety of other puzzles in particle physics,
astrophysics, meteoritics and planetary science. It is known that mirror matter
can interact with ordinary matter non-gravitationally via photon-mirror photon
kinetic mixing. The strength of this possibly fundamental interaction depends
on the (theoretically) free parameter $\epsilon$. We consider various proposed
manifestations of mirror matter in our solar system examining in particular how
the physics changes for different possible values of $\epsilon$. We find new
evidence for mirror matter in the solar system coming from the observed sharp
reduction in crater rates (for craters less than about 100 meters in diameter)
on the asteroid 433 Eros. We also re-examine various existing ideas including
the mirror matter explanation for the anomalous meteorite events, anomalous
slow-down of Pioneer spacecraft etc.
