Traces of methane were previously detected in vapour emanating from cracks in the surface of Enceladus, one of Saturn's moons that is icy.
Li noted scientists had believed the Moon to be "bone dry" until about a decade ago,
Even though President Trump himself has said little about the subject, his close circle and some former NASA officials have made clear their interest in...
"Even at the age of 82, Gene was passionate about sharing his desire to see the continued human exploration of space."
"The multiple impact scenario is a more 'natural' way of explaining the formation of the Moon."
Supermoons are actually quite common -- there is one every 14 months on average.
The next comparable event will be in 2034, when the Moon will come even closer, by 64km, to Earth.
Asteroids and comets crashing into the Moon create 180 new craters every year.
Next month, a Russian Proton rocket is scheduled to launch the first of two missions under ExoMars, a joint venture with the ESA
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