7 résultats pour "vostok"

• Vostok Program - astronomy.

  At almost five days in duration, Vostok 5 remains the longest solo space mission ever. Valeri Bykovskii flew alone for 81 orbits and 3 million km (2 million mi) from June14 to June 19, 1963. Valentina Tereshkova became the first woman in space when she flew aboard Vostok 6 from June 16 to June 19, 1963. On its first orbit, Vostok 6passed within 5 km (3 mi) of Vostok 5. Tereshkova flew on for 2 days 22 hours, covering 1.9 million km (1.2 million mi) in 48 orbits. Soviet engineers planned a Vostok...

• Antarctica - Geography.

  The maximum area of sea ice surrounding Antarctica each winter varies from year to year. A marked decline during the 1970s appears to have reversed in more recentdecades, except in the Antarctic Peninsula area. This area has lost almost 40 percent of its sea ice since the start of the 1980s. Sea ice is important to marine life. Krillfeed on algae that live under the sea ice and are released when the ice melts in spring and summer. In turn, many marine animals feed on krill. Emperor penguinsbreed...

• Yuri Gagarin - astronomy.

• Voskhod Program - astronomy.

• Valentina Tereshkova - astronomy.

• Le premier homme dans l’espace, Youri Gagarine

  Avec le premier vol habité effectué par Gagarine, l'URSS marque un point important dans la conquête de l'espace. Les États-Unis ne tardent pas à réagir avec le projet Mercury qui se déroule la même année. Au premier plan, de gauche à droite : Schirra, Slayton, Glenn et Carpenter. En arrière plan, de gauche à droite: Shepard, Grissom et Cooper. Le premier homme dans l'espace, Youri Gagarine Le 12 avril 1961...

• Space Exploration - astronomy.

  to produce 250,000 newtons (56,000 lb) of thrust. The Germans launched thousands of V-2s carrying explosives against targets in Britain and The Netherlands. Whilethey did not prove to be an effective weapon, V-2s did become the first human-made objects to reach altitudes above 80 km (50 mi)—the height at which outer spaceis considered to begin—before falling back to Earth. The V-2 inaugurated the era of modern rocketry. A2 Early Artificial Satellites During the years following World War II, the...