SPACE
Why hasn’t intelligent alien life found us?
D ID YOU KNOW ? The spacesuit worn by Neil Armstrong for the 1969 Moon landing was made by a bra manufacturer.
Sceptics have a simple answer: intelligent aliens have not contacted us because they don’t exist. But others argue that, given the enormous size of the Universe, it’s pretty much guaranteed that intelligent life must be out there somewhere. Maybe so, but there’s no guarantee it exists nearby, or has
learned of our existence through the ‘leakage’ of our TV and radio signals into space. So unless they’ve found a way of travelling far faster than the speed of light, we might be in for a long wait until they get here. Alternatively, perhaps they’re already here and we’re just too stupid to realise.
Can moons have moons? There is no reason why a moon could not have a moon. But for such a ‘submoon’ to survive for any length of time, it would require a stable orbit around its parent moon. This generally means that the sub-moon would have to be quite small and orbit quite close to the parent moon. The bigger the sub-moon is and the further it is from the parent moon, the more likely it will be influenced by the gravitational attraction of the parent planet. Tidal forces can also easily prevent a stable orbit being possible. So, moons of moons are possible but probably extremely rare.
Moons of moons are probably a rare phenomenon
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