Disadvantages of In-Office Whitening. 1  In-office bleaching is more expensive than take-home alternatives. 2  Its cost, on average, is $650, compared to $400 for take-home trays and under $100 for over-the-counter bleaching trays or whitening strips.
Planetary protection is a guiding principle in the design of an interplanetary mission, aiming to prevent biological contamination of both the target celestial body and the Earth in the case of sample-return missions.
Planetary geology, sometimes referred to as Exogeology or Astrogeology, is the study of the physical characteristics of planetary bodies in the solar systems. Specifically, planetary geologists focus on how planets and their satellites formed and have developed.eology of Mars Two small moons: Phobos and Diemos Geology is unique in the solar system but most similar to Earth.