| Type | Souvenir Sheet |
|---|---|
| Quality | Mint Never Hinged/MNH |
| Color | Multi-Color |
| Region | Malawi |
| Theme | Space |
| Grade | Ungraded |
| Certification | Uncertified |
Check the listing for details. Malawi Albert Einstein Space Earth Rocks Stars Sky Souvenir Sheet Mint NH. Color: Multi-Color. Listed at 15.86 USD. However, he realized that the principle of relativity could also be extended to gravitational fields, and he published a paper on general relativity in 1916 with his theory of gravitation. He also investigated the thermal properties of light which laid the foundation of the photon theory of light.
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