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Since Russia’s Sputnik 1 satellite entered space on 4 October 1957,
thousands of spacecraft – including Earth satellites and deep-space
probes – have launched into the cosmos. In these past five decades space
travel has truly come on leaps and bounds, with the development of
liquid and solid fuels and the use of solar panels and radioactive power
sources among many of the impressive innovations, allowing space
agencies across the planet to undertake evermore ambitious missions that
would once have never been thought possible. more...
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