Why Mercury and Venus don’t have moon?
Mercury is the first and closest planet to the sun and its gravitational pull in our solar system. Due to such high gravity mercury can’t hold on to it’s moon.
If mercury have a moon, it may crash into mercury’s surface or be pulled by the sun into it.
The question why the planet Venus doesn’t have a moon is still an unsolved mystery for the space explorers.
Even though Venus has the gravity that is strong enough to hold on to it’s moon but it’s moonless. We are given two possible theories for “Why Venus is moonless?”
The first is same as like the case of mercury.
It states that Venus once had a moon but was stolen by our sun which is similar to the case of mercury.
More probable and complicated double impact theory.
When earth was hit by a mars sized object the debris that flew off from earth coalesced its orbit raising the birth of the Earth’s moon.
Similarly, Venus was impacted twice by other celestial objects. By the time of first impact Venus was rotating from west to east just like other planets and the first impact resulted in it’s moon.
But the second impact was so huge that it was hit by a bigger body this time.
The second impact is believed to be the reason that Venus changed it’s rotational direction.
The change in the direction of rotation had weaken the tidal forces on it’s moon, sending the moon to disappear forever.
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