Two events on a June 10
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Explorer 49 - USA Solar Probe - 328 kg - was launched on June 10, 1973.
Explorer 49 (RAE-B) was a 328 kilogram satellite intended for longwave radio astronomy research. It had four 230-meter long X-shaped antenna elements, which made it one of the largest spacecraft ever built.
This mission was the second of a pair of Radio Astronomy Explorer (RAE) satellites, Explorer 38 (RAE-A) being the first. Explorer 49 was placed into lunar orbit to provide radio astronomical measurements of the planets, the sun, and the galaxy over the frequency range of 25 kHz to 13.1 MHz. Becauses the spacecraft's design used gravity gradient booms, the lumpy lunar gravity field caused problems for the mission scientists.
Explorer 49 was launched after the termination of the Apollo program, and although it did not examine the Moon directly, it became the last American lunar mission until the launch of Clementine spacecraft in 1994.
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Spirit (MER-A) - USA Mars Rover was launched on 10 June 2003
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