Stamp: "Luna-17" on the Moon (Soviet Union, USSR 1971)
"Luna-17" on the Moon (Soviet Union, USSR 1971)
16 March (Soviet Union, USSR ) within release Soviet Unmanned Probe "Luna-17" goes into circulation Stamp "Luna-17" on the Moon face value 10 Russian kopek
| Stamp "Luna-17" on the Moon in catalogues | |
|---|---|
| Michel: | Mi: SU 3861 |
| Unificato: | Un: SU 3707A |
Stamp is horizontal format.
From Souvenir SheetAlso in the issue Soviet Unmanned Probe "Luna-17":
- Stamp - "Luna-17" on the Moon face value 10;
- Stamp - "Lunokhod A-1" Tracks on the Moon's Surface face value 12;
- Stamp - "Lunokhod-1" on the Moon's Surface face value 16;
- Stamp - Control Room and Radio Telescope face value 12;
Stamp "Luna-17" on the Moon it reflects the thematic directions:
The Moon is Earth's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces between Earth and the Moon have over time synchronized the Moon's orbital period (lunar month) with its rotation period (lunar day) at 29.5 Earth days, causing the same side of the Moon to always face Earth. The Moon's gravitational pull – and to a lesser extent, the Sun's – are the main drivers of Earth's tides.
Outer space (or simply space) is the expanse that exists beyond Earth's atmosphere and between celestial bodies. It contains ultra-low levels of particle densities, constituting a near-perfect vacuum of predominantly hydrogen and helium plasma, permeated by electromagnetic radiation, cosmic rays, neutrinos, magnetic fields and dust. The baseline temperature of outer space, as set by the background radiation from the Big Bang, is 2.7 kelvins (−270 °C; −455 °F)
