Flights to the Planets USA Pioneer IV V Space Block of 4 Stamps MNH China We study major extinction events

We study major extinction events of the past in the hope of applying our conclusions to extinction in the modern world as global climates and environments change

Perisserosa guttata guttata (Gmelin

Abila Mons

Le Nain and La Tour

Soviet Spatial Exploration Space Astronaut Valeri Bykovski Valentina Sov

Flights to the Planets USA Pioneer IV V Space Block of 4 Stamps MNH China We study major extinction eventsFlights to the Planets USA Pioneer IV V Space Block of 4 Stamps MNH Pioneer 4 was an American spin stabilized unmanned spacecraft launched as part of the Pioneer program on a lunar flyby trajectory and into a heliocentric orbit making it the first probe of the United States to escape from the Earth's gravity. It carried a payload similar to Pioneer 3: a lunar radiation environment experiment using a GeigerMller tube detector and a lunar photography