Stamp: ROSETTA probe (comet) (Guinea 2003)
ROSETTA probe (comet) (Guinea 2003)
03 March (Guinea ) within release Space Satellites and Probes (2003) goes into circulation Stamp ROSETTA probe (comet) face value 3,000 Guinean franc
| Stamp ROSETTA probe (comet) in catalogues | |
|---|---|
| Yvert et Tellier: | Yt: GN 2583 |
Stamp is square format.
Although this issue was authorized by the Guinea postal administration, virtually the whole issue was not sold in Guinea, but only distributed by the Guinea philatelic agency Impressor S.A. for distribution onto the philatelic market.Also in the issue Space Satellites and Probes (2003):
- Stamp - Ceres-Vesta probe (2006) face value 3,000;
- Souvenir Sheet - Ceres-Vesta probe (2006) face value 3,000;
- Souvenir Sheet - COROT space telescope face value 6,000;
- Stamp - DEEP SPACE probe face value 3,000;
- Souvenir Sheet - DEEP SPACE probe face value 3,000;
- Stamp - Mars Rover (2003) face value 3,000;
- Souvenir Sheet - Mars Rover (2003) face value 3,000;
- Stamp - Multi Scout Mars Lander face value 3,000;
- Souvenir Sheet - Multi Scout Mars Lander face value 3,000;
- Stamp - NEAR probe. (asteroid) face value 3,000;
- Souvenir Sheet - NEAR probe. (asteroid) face value 3,000;
- Stamp - NGST space telescope face value 3,000;
- Souvenir Sheet - NGST space telescope face value 3,000;
- Stamp - ROSETTA probe (comet) face value 3,000;
- Souvenir Sheet - ROSETTA probe (comet) face value 3,000;
- Stamp - STARDUST probe face value 3,000;
- Souvenir Sheet - STARDUST probe face value 3,000;
Stamp ROSETTA probe (comet) it reflects the thematic directions:
A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or coma surrounding the nucleus, and sometimes a tail of gas and dust gas blown out from the coma. These phenomena are due to the effects of solar radiation and the outstreaming solar wind plasma acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times Earth's diameter, while the tail may stretch beyond one astronomical unit. If sufficiently close and bright, a comet may be seen from Earth without the aid of a telescope and can subtend an arc of up to 30° (60 Moons) across the sky. Comets have been observed and recorded since ancient times by many cultures and religions.
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)
A satellite or artificial satellite is an object, typically a spacecraft, placed into orbit around a celestial body. They have a variety of uses, including communication relay, weather forecasting, navigation (GPS), broadcasting, scientific research, and Earth observation. Additional military uses are reconnaissance, early warning, signals intelligence and, potentially, weapon delivery. Other satellites include the final rocket stages that place satellites in orbit and formerly useful satellites that later become defunct.
