When we think of planets, we usually picture them with moons. Earth has one, Mars has two, and Jupiter has over a hundred! But if you look at the two planets closest to our Sun, you’ll notice something missing.
Why do Mercury and Venus have exactly zero moons? Check out this quick video to learn why these planets travel alone:
The Solar System’s Lonely Planets
As the video explains, Mercury and Venus orbit closest to the Sun, but they remain remarkably lonely without any moons of their own.
You might think that because they are planets, they should be able to capture at least one passing asteroid, just like Jupiter did. However, their location in the solar system makes that impossible.
The Power of the Sun’s Gravity
The reason these planets are moonless comes down to a cosmic tug-of-war. The Sun’s intense gravity pulls on Mercury and Venus so strongly that any potential moon would be ripped away.
For a moon to stay in orbit around a planet, it needs a stable path. If a space rock tried to orbit Mercury or Venus, the overwhelming gravitational pull of the Sun would overpower the planet’s gravity, eventually pulling the moon away and crashing it into the Sun.
Without a stable path to hold onto a moon, these two planets must journey through the solar system entirely on their own!
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