If all goes according to plan, the only space sibling team will be hooking up in orbit. And not only are astronauts Scott and Mark Kelly brothers, they're identical twins. Scott took off Friday on a Russian Soyuz rocket to begin a five and a half month mission as the next commander of the International Space Station. Mark is the next commander of the space shuttle Endeavour, scheduled to lift off in February and hook up with the space station March 1st.
They will become the first blood relatives to meet up in space. So how will they mark the historic occasion? "We're going to arm-wrestle," said Mark.
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