If the risks posed by equipment malfunction, micrometeorite impacts, and solar radiation were not enough for anyone planning a trip to Mars, here is another one to contend with. Long periods spent in space can cause a shrinking heart. Humankind ventured into space sixty years ago this month. Since April 1961, our astronauts and cosmonauts have been confined to low Earth orbit, together with eight missions to the Moon, six of which landed people there. At some stage, serious planning will begin regarding a trip to Mars.
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