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First human-crewed orbital flight in USSR's Vostok 1:Who and When?

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Yuri Gagarin in Sweden Vostok 1 (Russian: Восто́к, East or Orient 1) was the first spaceflight of the Vostok programme and the first manned spaceflight in history. The Vostok 3KA space capsule was launched from Baikonur Cosmodrome on April 12, 1961, with Soviet cosmonaut Yuri Gagarin aboard, making him the first human to cross into outer space. The orbital spaceflight consisted of a single orbit around Earth which skimmed the upper atmosphere at 169 kilometers (91 nautical miles) at its lowest point. The flight took 108 minutes from launch to landing. Gagarin parachuted to the ground separately from his capsule after ejecting at 7 km (23,000 ft) altitude. In Politics The Space Race between the Soviet Union and the United States, the two Cold War superpowers, began just before the Soviet Union launched the world's first artificial satellite, Sputnik 1, in 1957. Both countries wanted to develop spaceflight technology quickly, particularly by launching the first succes...
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First photograph of Earth from orbit : Explorer 6

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7 August 1959 Explorer 6 Mission type Earth science Operator NASA Harvard designation 1959 Delta 1 COSPAR ID 1959-004A SATCAT  no. 15 Mission duration 60 days Spacecraft properties Manufacturer Jet Propulsion Laboratory TRW Launch mass 64.4 kilograms (142 lb) Start of mission Launch date August 7, 1959, 14:24:20 UTC Rocket Thor DM-18 Able III Launch site Cape Canaveral  LC-17A End of mission Last contact October 6, 1959 Decay date July 1, 1961 Orbital parameters Reference system Geocentric Regime Highly elliptical Semi-major axis 7,870.7 kilometers (4,890.6 mi) Eccentricity 0.7588469982147217 Perigee 237 kilometers (147 mi) Apogee 41,900 kilometers (26,000 mi) Inclination 47.0 degress Period 754 minutes RAAN 49.68 degrees Argument of perigee 47.26 degrees Mean anomaly 341.89 degrees Mean motion 1.89 Epoch 29 September 1959 15:00:37 UTC Revolution  no. 100 Explorer...
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The International Space Station drops out a tiny satellite that will search for matter

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You might think of satellites as large, imposing spacecraft that cruise through Earth’s orbit like hulking beasts, but that couldn’t be farther from the truth. Many modern satellites are tiny in size, but they do lots of very important work, and the International Space Station just dropped another one above Australia. Its mission will be to find missing matter. The mini satellite is called a CubeSat because, well, it’s shaped like a box, and this particular CubeSat is going to peer into the Milky Way and study its halo. What’s a galaxy halo? Well, dear reader, I’m so glad you asked! You see, when it comes to explaining the universe, astronomers have a pretty big problem on their hands. Based on past research and observations, scientists think they have a pretty good idea of how much of the universe if made up of normal matter (that’s what the Earth, the Moon, and even you yourself are made of), dark matter (nobody really knows what this is), and dark energy (a mysterious force t...
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