Two months after the launch of Vanguard 1, the Soviet Union followed with the launch of Sputnik 3. Like Sputnik 1, it was launched by a modified R7 Semyorka rocket, developed specifically for satellite launches.
Sputnik 3 had a more advanced scientific mission compare to its predecessors (Sputnik 1 and 2) and was the first Soviet satellite to carry a complete radio system for telemetry, tracking and command. It was equipped with twelve scientific instruments that gathered data on the pressure and composition of the upper atmosphere, the concentration of charged particles, cosmic ray photons and heavy nuclei, as well as magnetic and electrostatic fields, and meteoric particles. However, the spacecraft's tape recorder failed to function properly, limiting the amount of data that could be transmitted. The spacecraft could only send data back to Earth in real time, so the only areas it could study were those in range of Soviet tracking stations. As a result, it was unable to effectively map the Van Allen radiation belts.
Image source 📸 Енин Арсений/Wikipedia (CC BY-SA 3.0)

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Vanguard 1 is a symbol of the dawn of the space age and was launched on the 17th of march 1958. It is the fourth artificial Earth-orbiting satellite to be successfully launched and It was the first satellite to use solar cells for power, which was a groundbreaking technology at the time. This innovation extended its operational life far beyond initial expectations. Its longevity in orbit reflects the durability of early space engineering. Can you imagine, it was operating until 1964 and remains the oldest human-made object still in orbit to this day.

Vanguard 1 was launched primarily to gather data on the effects of the space environment on a satellite and its systems in Earth orbit. It provided data on the density of the upper atmosphere by analyzing how the residual atmosphere drag affected its orbit over time. It also contributed in gathering data on Geodesy, Earth's shape, dimensions, and gravitational field.

Vanguard 1's contributions to geodesy, solar-powered spacecraft technology, and the study of atmospheric drag have had a lasting impact on satellite design and space exploration. The satellite is often celebrated as a pioneering achievement in space science.

Image credit 📸 #nasa

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Explorer 1, officially known as Satellite 1958 Alpha, was the third artificial satellite to be send into orbit. With this launch the US joined the Soviet into the space age, who had in the previous year successfully launched Sputnik 1 and Sputnik 2. 🚀🛰

Explorer 1 launched atop a Juno 1 booster from Cape Canaveral, on February 1, 1958.
The satellite weighted 13.97 kg, of which 8,3 kg were scientific instruments. It carried five temperature sensors, an acoustic detector and a wire grid detector to detect micrometeorites impacts. And finally it carried a G-M tube used for the detection of ionizing radiation (cosmic ray), to measure the density of electrons and ions in space. This last instruments helped Dr. Van Allen and his team to measure and to discover what is know now as the Van Allen Radiation belts. Once in orbit, the cosmic ray equipment of Explorer 1 indicated that all of the zero counts per second reports were from an altitude of more than 2,000 km over South America, while passes at 500 km would show expected level of cosmic rays. Dr. Van Allen theorized on the existence of a belt charged particles trapped in space by earth’s magnetic field.

Along the scientific instruments the payload was also composed of more than 29 transistors, Mercury chemical batteries (that made up around 40% of the payload weight) and four antennas to transmit data back to earth.

Explorer 1 continued returning data until its batteries were exhausted on February 28, 1958, but remained in orbit until March of 1970. Quite tough for a first satellite 🛰

Image credit 📸 #nasa

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SpaceX celebrates the build of its 100th Starship Raptor engine

https://www.teslaoracle.com/2021/07/28/spacex-celebrates-the-build-of-the-100th-starship-raptor-engine/

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