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 Resources is targeting asteroid types that are rich in water (C-type), or rich in precious metals (X-type) as they offer the most value and will positively affect growth of a spec economy.lanetary Resources is targeting asteroid types that are rich in water (C-type), or rich in precious metals (X-type) as they offer the most value and will positively affect growth of a spec economy.