NASA's GRAIL Mission Resolves Mystery of Moon's Asymmetrical Hemispheres
| Aspect | Details |
|---|---|
| Event | NASA's GRAIL mission resolves mystery of Moon's asymmetrical hemispheres |
| Mission Name | GRAIL (Gravity Recovery and Interior Laboratory) |
| Launched | 2011, from Cape Canaveral via Delta II rocket |
| Managed by | Jet Propulsion Laboratory (JPL) |
| Scientific Lead | Massachusetts Institute of Technology (MIT) |
| Components | Two spacecraft -- Ebb and Flow, flown in tandem |
| Objective | To map the Moon's gravity field with high precision |
| Key Discovery | Gravitational and thermal differences caused by Earth's pull and internal heat sources |
| Crustal Differences | Nearside: Thinner crust, volcanic activity, basaltic plains (mare) |
| Farside: Thicker crust, rugged, heavily cratered, less volcanic activity | |
| Heat Flow and Elements | Nearside: Higher thorium and titanium levels, mantle ~200°C warmer than farside |
| Tidal Effects | Nearside experiences greater tidal flexing due to Earth's gravity |
| Significance | Solves lunar geological puzzle, aids understanding of planetary formation and evolution |
| Future Implications | Supports lunar exploration missions and landing site selections |